- For the actual X-Event within Cross, see X-Event!Chara.
|“||By the way, Sans, that heart locket doesn't belong to you.||„|
|~ Cross telling Sans regarding his heart locket.|
X-Tale!Sans (better known as Cross) is the main protagonist of X-Tale, and the antihero of Underverse. In X-Tale, X-Tale!Sans was a trainee for the royal guard who began experiencing issues related to his code; which is actually relatable to The X-Event's cause. After he seals their main soul within him to result in his universe's corruption, and his realization that he couldn't overwrite, he finally obliges to follow what Cross!Chara tells him to.
X-Tale!Sans used to live his life as a trainee for the royal guard, but while taking a test with X-Tale!Undyne, his urge to kill X-Tale!Frisk was within him, causing X-Tale!Papyrus to stop him before it was too late. However, his genocide code was regenerating once more, culminating into a murder of Frisk upfront at a peace ceremony, as that ends up also resetting without the incident taking place.
With confusion in his mind, X-Tale!Frisk comes up to Sans and tries to convince him to kill him for the purpose of getting a happier timeline. He refuses, and Frisk uses his time to defeat Sans, giving him his iconic nickname "Cross" before XGaster resets back to the day the brothers took Undyne's test. As it turns out, everyone was now against XGaster, and because of his ignorance to see the trouble of his "dad", everyone ganged up against him, including his own brother.
Realizing the X-Event's demands, he goes out of the way to kill the entire cast of characters (except X-Tale!Alphys and XGaster), and absorbs the soul of the X-Event to grant him the power. As it turn out however, his monster soul weakened the ability to use most of the powers of the X-Event, and after finishing off X-Tale!Frisk, his depression worsened.
Between X-Tale and Underverse
With his universe in shambles, and his realization of his weakened powers, Cross tears ends up attracting Ink!Sans. Ink's constant visiting helped Cross control Cross!Chara within him. Later, he's met by Core!Frisk, who tries to take him somewhere safe, but he denies, saying that his world was still there, despite Ink saying otherwise.
Staying in his own world, however, allowed Error!Sans to get into his universe and take his soul. Ink tries to intervene, but is taken down by Error when he tries to save Cross. Without their own soul, he was now living off of Cross!Chara's determination with a time limit, and left Ink alone as they searched for a soul to live off of.
With his life at risk, Cross intercepts his world to Sans to try to take his place. Sans nearly kills Cross over this, but after he explains what's happening, he takes half of his soul. Before the both of them can do anything about it, Ink shows up to steal the spotlight. Sans and Ink both defeat Cross, but he ends up escaping anyways with half of Sans's soul.
With motivation from Cross!Chara himself, Cross adsorbs Sans's half soul. He even tells him of other universe, but Cross!Chara doesn't realize that they have no place to go. He immediately becomes angry over the issue, and this attracts Nightmare!Sans. They both make a deal: If Cross can hurt someone mentally in each universe he takes him, he can take parts of their world to rebuild his. He's taken to his first universe, which Nightmare describes as "a rude place that is being turned around thanks to a little human and their stupid flower."
Cross immediately begins The X-Event within Underfell, but while marking the path for what he wants to take, he's stopped by Underfell!Sans. He tells him to either allow him to take parts of his world, or accept that his world is theirs, which Underfell!Sans refuses, and despite his best, Underfell!Sans is taken hostage by Cross himself. Ink isn't pleased over the situation, and after Sans decides to handle the problem, Cross uses his HACK Knife to take control of Underfell!Sans himself.
The four of them begins their assault, as the X-Event begins taking parts of the world to his. After trapping Underfell!Sans, Sans begins explaining his experience with half a soul, stating that he saw XGaster himself, and would harm him if he finds out that he's in league with them. Cross!Chara tells him to escape afterwards, and once Underfell!Sans is freed from his control, they both flee.
With the Underfell Snowdin in their hands, Cross is stunned over Cross!Chara's remarks, citing he should've gotten a soul for himself. When he convinces Cross to sleep, he finds out that it was a trap, and that Cross!Chara was taking over, which he narrowing stopped by stabbing his left eye.
Nightmare takes Cross to a Underswap pacifist timeline after getting into a heated argument about the deal. Mistaking him for his brother, Underswap!Papyrus proceeds to let the whole world know of Cross's existence. He's soon made aware of how similar the codes are in this universe, and throws the bucket at Toriel, doing what Nightmare told him to do.
Everyone soon arrives at where Cross was striking at everyone in Underswap, and Ink knows how similar his and their universe are, convincing him to step down from what he's doing. This distraction caused by Ink and Underswap!Sans gave enough time for Underfell!Sans and Classic!Sans to take him down. Classic soon reunites his own soul, disabling Cross, but allowing Cross!Chara to proceed with his own doings.
He only makes one appearance in the second part, appearing as an illusion thanks to him and Underswap!Sans's similar code. X-Event!Chara even mistakes the latter for him.
During Error's dream, Cross is seen with Cross!Chara regarding taking Undernovela Frisk. They argue whether or not they should take their soul, but they're caught redhanded by Asgoro and Sins.
Cross appears briefly at the end of the episode, after XGaster brings him back, though because X-Event!Chara is gone, he no longer has his scar or his red eye. He also appears in the credits sequence, where Dream!Sans helps him enter the Omega Timeline safely, as well as fighting his brother and Killer!Sans.
Cross has one white pupil and one red pupil, and a lightning bolt shaped "scar" under his right eye socket, gained during his fight against X-Tale!Frisk before X-Tale!Gaster resets. His original soul was half an upside-down white monster soul and half a red human soul.
He wears mostly black and white, same with the rest of the X-Tale cast. His attire consists of a black jacket with a hood and several white attachments and white fluff on the hood, black shorts with white Xs on each leg and white shoes with Xs on them. He wears a gold locket and a black and white tattered scarf and fights with the HACK Knife, a giant knife capable of corrupting codes itself.
When he is brought back in Underverse 0.4, the red eye and scar are no longer present.
Before the events of Underverse, Cross had the abilities of Classic!Sans but he was a master combatant as he was trained to be a Royal Guard. When he absorbed X-Event!Frisks soul, even though he didn’t gain the Overwrite button he gained the HACK Knife. Cross could use the HACK knife to take control of a victim by executing them temporarily to make the victim their puppet. Cross can also steal parts of universes with the blade. He can summon Gaster Blasters that have four eyes with red pupils, and laser beams that are red instead of the usual blue.
At first Cross was as compassionate as Classic!Sans, trying to believe in X-Event!Frisk even when he was trying to kill him. But when X-Event!Frisk took control of Cross’s friends including his brother X Tale!Papyrus, he lost all faith in X-Event!Frisk, and used all of his power to stop him by killing his former friends, even ruthlessly killing X Tale! Papyrus and absorbed Frisks soul. His greed and recklessness was shown as even when X-Tale!Chara told him he couldn’t overwrite, he killed X-Tale!Frisk anyway. But once he realised he couldn’t overwrite he lost his mind being completely delusional over the loss of his own world, even to the point of throwing his negative feelings at X-Tale!Chara. Despite this, he's highly hyper over tacos and cookies, and was completely friendly before Ink told him that he couldn't revive the dead. Afterwards, he's completely arrogant over everyone else, and is disgusted by everything around him. Cross was also more active than ever, and was never lazy.
| X-Tale: Cross | X-Event!Chara | X-Event!Frisk | XGaster | X-Tale!Papyrus | X-Tale!Undyne | X-Tale!Toriel | X-Tale!Asgore | X-Tale!Asriel | X-Tale!Mettaton | X-Tale!Alphys