One possible plot could be Rick getting accidentally transported to Superjail. He would then use his scientific genius to try and find a way out while also causing chaos. Morty might follow him and they'd have to deal with the insane inmates and warden of Superjail. Maybe Rick would try to make a deal with the warden using some of his inter - dimensional gadgets.
A plot might be that Superjail is having some sort of technological meltdown. The warden hears about Rick and his advanced knowledge, so he kidnaps Morty to lure Rick in. Once Rick arrives, he realizes that the problems in Superjail are far more complex than he thought. He and Morty have to team up with some of the more friendly inmates to fix the issues and escape the insanity of Superjail.
Well, the plot could involve Morty being mistaken for a new inmate in Superjail. Rick would then break in to rescue him. Along the way, they'd encounter all sorts of crazy and dangerous situations. For example, they could run into some of the more deranged characters in Superjail who are fascinated by Rick's technology. Rick would have to use his wits and Morty's naivete to get through it all.
In a Rick and Morty Superjail crossover fanfiction, Rick might start trading his inventions with the warden of Superjail. The warden could be interested in Rick's portal gun to bring in new and strange inmates from different dimensions. Morty would be dragged along and might form an unlikely friendship with some of the more 'human' inmates, sharing his stories about his adventures with Rick which the inmates would find both crazy and fascinating.
Well, one possible plot could be that Rick accidentally opens a portal to the Inuyasha universe while trying to find a new energy source. Morty gets dragged along and they meet Inuyasha and his gang. Maybe Rick's advanced technology could be mistaken for some kind of powerful magic by the characters in the Inuyasha world. And Morty could befriend Shippo, since they are both kind of the sidekicks in their respective groups.
Rick and the Warden would be really interesting. Rick is so used to being in control and having his own set of rules in his own dimension. The Warden, on the other hand, is in charge of the chaotic Superjail. Their clash of egos and different ways of handling things would make for great drama. Rick would probably try to outwit the Warden, and the Warden would try to assert his authority over Rick.
Rick and the Warden. Rick is this super - intelligent, amoral scientist, and the Warden is this insane, power - hungry figure in Superjail. Their interactions would be wild. Rick would probably try to outwit the Warden at every turn, while the Warden would be fascinated and also threatened by Rick's intelligence and gadgets.
Well, perhaps the Fairy Tail guild somehow gets access to Rick's portal gun. Lucy might be fascinated by the different dimensions it can open. Rick could be intrigued by the magical power sources in the Fairy Tail universe. And Morty could end up learning some basic magic from the guild members. They all then team up to face a powerful enemy that has been causing chaos across multiple dimensions and universes.
One possible plot could be that Rick somehow gets his portal gun mixed up with one of Stewie's inventions. This could lead to the Griffins ending up in the Rick and Morty universe. Maybe Peter would be fascinated by all the strange creatures and start trying to make friends with them in his typical clueless way. Morty could try to show Chris and Meg around the multiverse, while Rick and Stewie start arguing about whose technology is superior.
A possible crossover fanfiction could involve Dipper and Mabel trying to get Rick to help them solve some of the really tough mysteries in Gravity Falls. Rick might initially refuse, but then Morty convinces him. And along the way, they get into all sorts of misadventures with Bill Cipher maybe getting involved and trying to use Rick's technology for his own evil purposes.
Imagine Rick figures out a way to use chakra in his own inventions. He and Morty could end up training with Naruto and the others. Rick would be impatient with the slow progress of ninja training at first. Morty would struggle to keep up with the physical demands. But as they progress, they could introduce new ideas to the ninja world like interdimensional travel for ninja missions. And in return, Naruto could teach them about the power of friendship and loyalty in a way that changes Rick's and Morty's perspective on things.
In a Rick and Morty Avengers crossover, the plot could center around a multiverse - threatening villain. This villain has the ability to disrupt the fabric of different universes, which catches Rick's attention as it could endanger his own universe. The Avengers, on the other hand, are just trying to protect Earth. Rick and Morty get pulled into the Avengers' world. Rick is reluctant to work with them at first but then sees the potential in their combined forces. Morty is in awe of the Avengers and tries to prove himself. Together, they embark on a wild adventure filled with action, humor, and lots of scientific mumbo - jumbo.
One possible plot could be that Rick and Morty accidentally portal into the Gravity Falls universe. They meet Dipper and Mabel, and Rick's technology starts malfunctioning because of the strange magical forces in Gravity Falls. Morty and Dipper team up to try and fix it while Mabel tries to get Rick to participate in some of her wacky Gravity Falls activities.