BenRex

BenRex is the slash ship between Ben Tennyson and Rex Salazar from the Ben 10 and Generator Rex fandoms.

Heroes United
A giant ball of energy is over Manhattan, which Rex is required too fight. Dr. Holiday then gets a reading of something inside when a creature starts to come out. Rex starts to fight it, but is thrown into central park. He puts on a brave face, which quickly fades as the creature comes out of the shadows. It's revealed to be Humungosaur, one of Ben's aliens, who tells Rex that he's made a big mistake. He starts to beat Rex into the ground, but he has a shield up that somewhat protects him. Ben tells him to stay down if he knows what's good for him, he'll stay down, but Rex just attacks him again. Ben says that Alien wannabees should know by now not to mess with "the 10", and Rex says that he must be an insane "evo". Rex then pulls Ben under water, where he transforms into Diamond Head. Rex then grabs onto the Ultimatrix but feels weird, Ben asking what he just did to him. Rex isn't sure, but he likes it and they continue their fight.

Rex knocks Ben into a bridge, and Ben calls it a lucky shot. Rex tells him to stay still so he can cure him, but Ben says that he's just talking crazy. He then transforms into Lodestar, much to Rex's surprise and they continue fighting. They call timeout when they knock over a billboard that puts civilians in danger, but Rex lands on Ben and calls time in when they're finished. He then tries to take away the nanites inside of Ben, but is surprised to find that he's not actually an evo. Ben just says he's trying to do his thing and Rex accuses him of wanting to destroy the city. Ben is confused and transforms back to his human self. He says he's Ben Tennyson, the greatest hero in the world, but no one reacts, much to his confusion. Six then arrives and destroys the alien that also came through the portal, but is hurt in the process. Rex is by his side and says that this is all Ben's fault.

Rex is told that they need to find the rest of the alien, when Ben interrupts saying he can help. Rex still blames Ben for what happened to Six, but Ben is genuinely sorry about what happened to Six. He has no idea what's going on though, and has no idea how he even got here. Holidays says Ben is telling the truth, but doesn't know how Ben got here. Ben says nothing is going to get done if they sit there talking, and Rex points out that they have him under house arrest. Ben says that they aren't, he was just seeing how he could help. He then transforms into Big Chill and phases through the tank. He then tells Rex that he isn't the only one worried about someone close to them, and takes off. Rex then quickly follows.

As Rex chases Ben, he asks him why he just doesn't go back to where he's from, and Ben says that's what he's trying to do. Rex wants to start a fight, when Ben is distracted by the changes in this version of Bellwood, much to Rex's annoyance. Ben starts to sit with the fact that he may never see his family or friends again, which makes Rex feels bad. He suggests that maybe they can help each other, and Ben asks if he'd really do that. They're then interrupted by Caesar arriving with his lab. Rex says it's his brother, and Ben asks if he does the same thing as Rex. Rex says that Caesar's a little crazy, but not bad, when Caesar fires a gun at them. Ben pushes Rex aside and turns into Diamondback, causing the gun to return fire to itself. Caesar then says they need it to fight the creature, Alpha, that appears behind them.

After a fight, Caesar takes the two into his lab and explains that Alpha has been leaving behind dead nanites. That it's part of what pulled Ben from his world. Rex is surprised that Ben actually is from a parallel world and Ben asks if he "science class[es] much". Caesar assumes that Alpha was attracted to the Ultimatrix and Ben explains that it's filled with the DNA of thousands of Aliens. Rex makes fun of that idea, much to Ben's annoyance.

Alpha then attacks the lab and Caesar takes off in the escape pod. As Alpha destroys it, Ben turns into Cannonbolt and grabs Rex as their vaulted to the ground. Rex complains about the smell, and Ben says that he can take it for the couple of seconds it took for Ben to save him. Rex apologizes, but is frustrated by how bad his days has gotten, especially since it seems like Caesar was trying to kill him. Ben suggests that Caesar was protecting them, and Rex asks if Ben is a glass half full kind of guy. Ben says that on crazy earth he is, and Rex gets a call saying that he needs to get Ben to New York if he ever wants to get home again. Rex says it's too bad since he's almost considered liking him, but Ben says that he's not leaving him while Alpha's still out there. Rex says that it's his problem, not Ben's, when he's told Alpha is at base.

As Holiday is being attacked at the base, Rex arrives to take out Alpha, while Ben, as XLR8, catches her. Rex asks if he would mind giving him a hand, and Ben says that he can give him four, turning into Four Arms. Rex is starting to like the way Ben thinks, and has Ben launch him at Alpha. They get held when Holiday shoots at Alpha, hitting Rex in the process, causing it to run off. Ben says that if Rex's brother is trying to kill him, and Holiday is his friend, he might be safer on Ben's earth. Holidays says that Rex is fine loosing his build.

They shoot hoops on the court, and Ben asks if he's seriously just gonna wait around. Rex says that Alpha wants his nanites, and would much rather go out and fight, but Ben figures that Rex's nanites need a break. Which Ben gets. He makes fun of Rex inability to shoot, but Rex just takes Ben's ball. Ben asks what happened to Rex to get him like that and Rex was about to ask Ben the same thing. They both explain their origins, and they both make fun of their team names. Rex then shoots the hoop again and Ben gives an assist, which Rex compliments. They get called back to the meeting room and are told where Alpha is and they start to head out. They accidentally grab the wrong jackets to put on, but don't realize till Ben's smells like banana's and Rex's is too tight. Bobo comments that if those two are the planets best hope, they're doomed.

As Alpha starts to drain Rex, he yells that he could really use an alien right now. Ben says he would but the Ultimatrix was drained, and Rex yells for him to do something. Ben then throws a rock, hitting Rex in the head, who then tells him to do something better. Ben suggests he call it names, when something unlocks in Rex and Alpha explodes. Rex is tossed through the air, just as the Unimatrix recharges. Ben turns into Big Chill and catches Rex, landing safely. Rex says that when he fight Alpha's control their nanites cancel each other out, when Alpha reforms and copies the Unimatrix to himself. He then transforms and Ben asks if he can do that. Rex says that he just did, and they flee till their forced to fight back.

The Unimatrix is recharged and Ben quickly uses it, accidentally turning into Shocksquatch. Rex tells him to blast Alpha, but Ben says that he's never seen the alien before. Rex says that's not filling him with confidence, but Ben is able to send an electric blast to Alpha. He's excited, but then ends up transforming back, much to his disappointment. Rex gets his Omega Nanite stolen, and Ben asks if he's okay. Rex says no, and thinks he knows what Alpha wants. Wanting to destroy humanity.

Rex blames himself for what's happened and Ben says that this wasn't how this was meant to play out. He's seen what Rex can do. Rex says his most powerful builds came from his Omega nanite, and Rex asks what they can do. Ben realizes what he can do, and transforms into Upgrade. He then goes inside of Rex, which feels weird, and asks what's supposed to happen now. Ben sticks his head out of the tech suit he made, which freak Rex out, and tells him to build something. Rex does, and it looks great. He asks Ben what the plan is, and Ben gives a simple run through, which works for Rex.

They fight but are eventually pulled apart and Ben returns to human form. Rex says that they need a direct hit on Alpha, and Ben says that if they need more insults he's got a good one. Rex tells Ben that when he attacks, he needs Ben to turn into Cannonbolt. Ben knows what Rex is thinking and asks if it's dangerous. Rex says probably and Ben suggests they go on three. Rex officially decides he likes Ben, and Ben feels the same. Rex then gets out his canon, putting Ben inside and fires out Cannonbolt. Destroying Alpha.

Rex gets the rest of the nanites into a dense ball, and Caesar says that they have to get rid of it. He opens a portal with a null gun, Ben and Rex giving each other a fistbump, before Ben goes over to it. Rex asks how he's going to carry it, and Ben says that he isn't. He turns into Upchuck and eats the ball, before telling Rex that they should do this again someday. Rex is very offput by Ben eating the ball, but waves goodbye as Ben leaves.

Rex tells Six about Ben, and how he was helpful when his watch actually worked. He says that Ben was a cool kid and wonders if he'll ever see him again. Holiday says that parallel dimensions don't make things in Rex's favor, but Six that some people are just meant to meet. He might see Ben again sooner than he thinks.

Moments
Heroes Unites
 * Ben punches Alpha, and Caesar yells not to let it touch Rex.
 * Ben shoots at Alpha before he can touch Rex.
 * Ben asks if a long explanation means something bad on Rex's earth too and Rex says that it does.
 * Ben catches Rex when Alpha knocks him back.
 * Rex and Ben simultaneously say "we can try" when asked if they can defeat Alpha.
 * Rex stops Alpha from hitting Ben.
 * Ben tells Rex that he has to admit Alpha looks cool as an alien, and asks if he should try those insults now.
 * Ben distracts Alpha while Rex takes him out.

Fanon
BenRex is pretty popular, especially for a crossover pairing that haven't interacted all that much.

On AO3, BenRex is the second most written ship for Rex and the ninth most written for Ben. It is also the ninth most written ship in the Ben 10 Series tag and the third most written in the Generator Rex tag.

Fandom

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Trivia

 * In "Heroes Unites" Rex comes up with a theme song for himself, which is the original "Ben 10" theme with the lyrics changed.