Xeno Goku's history is very similar to his main timeline counterpart's with him being known to have experienced versions of the Frieza and Cell Sagas, but unlike his main counterpart, he encountered the movies Tree of Might, Lord Slug, and Fusion Reborn as well as the events of Dragon Ball GT - having battled the Shadow Dragons in the past. At some point he encountered Broly. As such, Xeno Goku did not experience the events of Dragon Ball Super, and so was unaware of many of his main timeline counterpart's forms, especially Super Saiyan Blue, until they both met.
Dark Demon Realm Saga
In the manga, after Demigra reveals himself at the Time Nest, Chronoa decides that Xeno Trunks will need an ally in their fight against the Demon God and analyzes his memories to determine the strongest warrior he knows - Goku. Chronoa then summons Xeno Goku from his timeline to have him assist Xeno Trunks for a limited time, inducting him into the Time Patrol. Xeno Goku and Xeno Trunks then spend the next six months training and getting stronger though in reality it had only been three days due to Chronoa changing the flow of time in the room they were training in.
Dark Empire Saga
Xeno Goku's first mission was to correct an alternation in history involving his first fight with Frieza on Namek. In this altered history, Xeno Frieza, attached to the One-Star Dark Dragon Ball was overwhelming Goku even as a Super Saiyan. However, Xeno Goku along with Xeno Trunks arrived just in time to save Goku from dying. The two Gokus then fire a Super Kamehameha at Frieza and though he is able to hold each of them back, it causes enough distraction to enable Xeno Trunks to slice him in half, correcting history.
Xeno Goku's next mission involved correcting the history of Xeno Majin Buu, who had merged with another Dark Dragon Ball, the Three-Star. However, the Dark Empire army arrive along with their commander, the Demon God Dabura who intervenes in Goku and Buu's battle. When Dabura slices Buu in half he turns his attention to Goku but dropping his guard the conflict started to escalate when Buu absorbs Dabura. Soon enough, Chronoa appears bringing along Xeno Trunks and Xeno Vegeta as back up. With no other choice, Xeno Goku fuses with Xeno Vegeta once more to form Xeno Vegito. While they were successful at holding their own against the powered up Dark Demon God Buu, they were stopped in their tracks by the sudden appearance of the mysterious Chamel and as a result Buu escapes. Recovering from the mission, they were soon approached by Chamel, who complimented their usefulness before hinting that Hell is becoming more and more agitated.
Chamel takes the Xeno Goku and Xeno Vegeta to Hell where they confront Towa and the grim reaper, Shroom who had moments earlier defeated Xeno Janemba. Chamel tells Xeno Goku and Xeno Vegeta to attack Shroom while he deals with Towa and they all begin to battle. Xeno Goku and Xeno Vegeta struggle against Shroom as they have little strength after having their souls mowed, one of Shroom's special abilities. With little other choice, Xeno Goku and Xeno Vegeta use the Fusion Dance to become Xeno Gogeta and transform into a Super Saiyan before urging Shroom to fight him again.
The battle rages on with neither having a clear advantage. When a dark portal opens up above the two, the time limit for Xeno Goku and Xeno Vegeta's Fusion runs out. When Goku flies off to head through the portal, Shroom attempts to stop him but Xeno Vegeta intervenes by grabbing his Scythe, allowing Xeno Goku to get away while Xeno Vegeta faces off against Shroom alone.
When Xeno Goku comes through the other side of the portal he finds himself in the Demon Realm and sees Super Saiyan 4 Dark Broly battling against Demon Goddess Towa. Upon seeing Xeno Goku, Broly goes into a fit of rage and attacks him immediately. Towa and Xeno Paragus take the opportunity to attack Xeno Broly but Paragus is punched hard, knocking him through the same portal that Xeno Goku travelled through, and Towa is knocked out. Shortly after, Mira also appears through a portal and absorbs the unconscious Towa to enter a more powerful form which he then uses to battle Broly. Seeing the ongoing battle between the two, Xeno Goku powers up into his Super Saiyan 4 state as well and heads into battle as all three fighters battle it out against one another at the same time. The three prove to all be on par with each other and end the battle each with a large beam of energy causing a huge explosion that knocks out Xeno Goku and Broly causing his Dark Dragon Ball to fall out of his chest though Mira is left standing.
Shortly after the battle, he rejoins the rest of the Time Patrol in the Demon Realm as they attempt to stop Mechikabura from having his wish granted by Dark Shenron. He battles with his allies against Mechikabura's subordinates, fighting against Shroom but due to still being tired from his earlier battle, fuses with Xeno Vegeta to become Super Saiyan 4 Xeno Gogeta who quickly turns the tables on his enemies.
Dark King Mechikabura Saga
In the game, after Tokitoki speeds up Xeno Goku and Xeno Vegeta's healing process, the two head for the Time Nest upon hearing that Demigra has attacked. There the Time Patrol encounter and battle the Xeno Shadow Dragons including Xeno Omega Shenron and attain victory. However when it comes time to battle Demigra himself he instead offers a truce knowing that Mechikabura has escaped from the Time Labyrinth.
In the manga, Xeno Goku and the other members of the Time Patrol are thanked for their work in preserving the timelines by Old Kai when Trunks notices another disturbance. The Time Patrol head to Age 790 where they witness Gogeta fighting against Omega Shenron. Soon after arriving, their present timeline counterparts, friends and family under a form of mind control attack them and Xeno Goku finds himself battling against Majuub. Shortly afterward Demigra and his henchmen Chamel and Robelu appear. With Towa and Dabura also in the area sporting a new more powerful Demon God state, Robelu tells Xeno Goku and Xeno Vegeta to fuse. Doing so they become Xeno Gogeta and later defuse upon everyone being teleported by Chamel to Demigra's lair.
The Time Patrol are told by Chamel of the six Hell Gates and that behind each one lies a Demon God who is maintaining a barrier to Mechikabura's Palace and they must all be defeated. Xeno Goku heads through the Blue Hell gate where Salsa is it's protector. Xeno Goku fires a Kamehameha but Salsa swings his sword, producing a gale of wind that sends the energy blast back, causing it to hit Xeno Goku directly. Xeno Goku charges in for a physical confrontation but is caught up in Salsa's Trick of Tornado technique which cuts away at him. As Salsa rushes in with his sword to put an end to things, Xeno Goku counters by using his Power Pole to hit his opponent in the stomach. With the tornado fading, Xeno Goku transforms into a Super Saiyan and fires a second Kamehameha to defeat the demon.
He then returns to the hideout where he is subsequently frozen briefly by the mind controlled Chronoa and later struck by a mass of dark energy belonging to Mechikabura. Heavily injured, unable to fight and with Xeno Trunks being the only one left standing thanks to his Key Sword, Xeno Goku along with the other Saiyans give Xeno Trunks their energy so that he can go on to face Mechikabura at the Time Nest, unexpectedly transforming him into a Super Saiyan God in the process.
After recovering, Xeno Goku and the others travel through a rift to the now desolate Time Nest to assist Xeno Trunks and Chronoa in their final battle against Mechikabura. Xeno Goku having obtained the Key Sword (that had been previously thrown away by Mechikabura) hands it over to Chronoa so she can recharge it. As the others attempt to buy her some time, Xeno Goku and Xeno Vegeta use Old Kai's Potara to fuse into Super Saiyan 4 Xeno Vegito to battle Mechikabura. This allows enough time for Chronoa to recharge the Key Sword enabling Xeno Trunks to deliver the final blow and seal Mechikabura away in an eternal labyrinth. After Tokitoki assumes a giant form and restores the Time Nest to it's original state, Xeno Vegito defuses and everyone celebrates their hard earned victory.
Prison Planet Saga
Xeno Goku heard about Fu scheming on a strange planet and so, allowed himself to be captured while out on patrol in order to investigate the Prison Planet for himself.
Xeno Goku encounters his main timeline counterpart who is searching for Future Trunks and believes him to be in allegiance with Fu. Super Saiyan 4 Xeno Goku battles Super Saiyan Blue Goku and the two seemingly prove to be an even match for one another. Xeno Goku is surprised at meeting a version of himself with a power that he does not know about. In the arcade video game only, Goku defeats Xeno Goku, who is left to catch his breath after the battle, realizing that his counterpart is a step above him. Goku asks Xeno Goku about Fu, but before Xeno Goku can answer Fu shows up. Xeno Goku reveals that he allowed himself to be captured to investigate. Fu tells the group that to leave the Prison Planet they need seven Special Dragon Balls held by the prisoners, with Xeno Goku already in possession of the One-Star ball. After Fu heads back to his laboratory, Xeno Goku heads off in search for him alone.
In the game, Xeno Goku is ambushed by Majin Ozotto, who steals his Special Dragon Ball and runs off.
He later returns along with Xeno Vegeta and destroys Fu's laboratory. They then head to the battlefield to face the evil Saiyan, Cumber, saving Goku in the process. On Xeno Vegeta's suggestion the two fuse into Super Saiyan 4 Xeno Vegito. After overpowering Super Saiyan 3 Cumber, the two defuse. When Fu arrives, he points out that they are responsible for destroying his lab and now also the seal surrounding the Prison Planet. As Fu powers up into his Super Fu state, Xeno Goku and Xeno Vegeta state it is their mission as the Time Patrol to capture him and prepare to face him in battle.
The two Time Patrollers end up at a disadvantage, but the battle is cut short due to Cumber returning. Cumber retaliates by throwing a giant energy blast at the pair and the Saiyans begin to lose ground as it forces them slowly backwards. The two are saved however when Goku awakens from his earlier defeat and enters into his Ultra Instinct state which he sues to deflect the blast away. Xeno Goku is amazed at what Goku has become but quickly realises that now is the time to teleport everyone away from the planet before it explodes.
Universal Conflict Saga
In the anime, upon returning to Beerus' Planet, Xeno Goku says his farewells and teleports away.
Universe Creation Saga
Xeno Goku and Xeno Vegeta arrive on Earth and intervene in the battle between Goku, Vegeta and Xeno Trunks against Beerus, telling them that their fight is pointless as they point out the growing Universe Tree that has appeared in the sky. They tell the group that they have heard the situation from Chronoa, with Beerus realising that they are from another dimension. After Fu appears and shares the details of his plan to create a new universe he disappears once more. Xeno Goku and Xeno Vegeta head off together to do their own investigation on the matter, heading to Hell where they encounter the mysterious Dr. W.
Dr. W begins his analysis, firing off an energy attack towards Xeno Goku which vanishes before re-appearing behind him and striking him in the back, almost knocking him into the lava. After Xeno Vegeta fails to gain much traction even as a Super Saiyan 3, Xeno Goku too transforms into the form and fires a barrage of small Ki blasts at Dr. W. However, Dr. W analyses the blasts and cancels them out with another attack of his own as he begins to gain an advantage. Becoming frustrated, the two Saiyans transform into Super Saiyan 4 with Xeno Goku firing a Kamehameha and Xeno Vegeta a Galick Gun though the attacks appear to do no damage. Saying that his analysis is complete, Dr. W disappears through a distortion, leaving the two to wonder what he meant.
At a later point in another area within Hell, Xeno Goku and Xeno Vegeta, both as Super Saiyan 4, battle against the reborn Janemba but even together struggle against him due to Janemba having data on both of their abilities. When Goku and the others arrive into Hell through a time distortion, Xeno Goku joins Super Saiyan Blue Goku in teaming up against the demon, finally managing to land a blow though it leaves no notable damage. Even with the arrival of Salsa and Putine, the group are not able to gain an advantage.
Salsa suggests that Xeno Goku do the same thing he did against the Shadow Dragons once before, and with little other choice, Xeno Goku asks for Goku, Vegeta, Xeno Trunks and Xeno Pan to share their energy with both himself and Xeno Vegeta. The resulting Saiyan power allows the two to enter into the Super Full Power Saiyan 4 Limit Breaker state where they quickly display superiority over Janemba and destroy him using the Limit Breaker Double Ultimate Dragon Fist technique. After having achieved victory, Xeno Goku and the rest of his allies are transported to the Crack of Time via Putine's magic.
Upon arrival, they barely have enough time to see the tree before Xeno Goku and the rest of the Time Patrol are forcibly transported away to another location by Towa. There, they find themselves unable to move, bound by Cumber's dark energy where they helplessly watch events unfold in the Crack of Time. Towa explains to the group that she created Fu and intends to make him the next Dark King and extracts a dark energy from their body which they unknowingly took on following Mechikabura's defeat. Refusing to allow that to happen, Xeno Goku forces himself free from his restraints but is immediately hit by the arriving Mira. With Towa and Mira having no further use of them, the Time Patrol are sucked through a vacuum to another location.
New Space-Time War Saga
Xeno Goku finds himself back in the Crack of Time where he once again fuses with Xeno Vegeta to become Xeno Gogeta in order to take on the powered up Fu but is ultimately overpowered and defuses. Fu then throws the Vegeta's into a dark vortex to prevent further fusion, but the Goku's receive some unexpected backup in the form of Chronoa. Chronoa heals the pairs injuries and asks that the two power up to their limit. She then performs a technique that allows the two Saiyans to merge their Ki together.
They attack with a combined Kamehameha, which breaks through all of Fu's barriers, forcing him to block it himself. Despite Fu stating the attack was dangerous, Xeno Goku notes that, even with this immense power, he and his alternate self are still unable to beat the Dark King. Fu begins absorbing power from the Universe Tree, and to an extent, all of the universe itself. The Goku's and Chronoa notice this, and with a flap of a wing, Fu sends a tendril at Chronoa, with Xeno Goku quickly intercepting by taking the blow himself.
Eventually Goku goes on to defeat Fu alone by harnessing the power of the Universe Tree and Xeno Goku is sent back to where he came from after Tokitoki uses his power to restore Universe 7.
Supreme Kai of Time Saga
Xeno Goku along with a few of his fellow Time Patrollers, enter into Aeos' Space-Time Tournament. Once transported to the battlefield, Xeno Goku confronts Goku, voicing his excitement at the prospect of facing him again but says that he is actually there as he has business with the tournaments host. Before he can explain his reasons as to why, the two Goku are ambushed by another team.
They quickly take them down before setting sights on each other as the prospect of facing another Goku is too exciting to pass up. Xeno Goku transforms into Super Saiyan 4 and Goku into Super Saiyan Blue and begin their rematch until it is halted due to members of their team finding Time Fairies which return them to the main hall having progressed through the initial round.
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