One idea could be the little sister developing a new power that none of the other Lab Rats have. This would cause a stir in the group as they figure out how to handle it.
Perhaps a story where the little brother gets transported back in time to when the lab rats were first created. He could be the one to influence some of the early decisions made in the lab, like suggesting a different design for their living quarters or a new way to approach their training. This would change the course of their development and create a whole new set of adventures for both him and the lab rats.
A really interesting plot for Lab Rats Family fanfiction could be centered around a villain who is specifically targeting the family because of their unique bionic abilities. This villain could be someone from the past, like an old scientist who was involved in their creation but had a falling out. The family would then have to work together, using their individual strengths and the power of their family bond to defeat this villain. Along the way, there could be moments of self - discovery for each family member as they face different challenges posed by the villain.
One idea could be Taylor and Leo teaming up to solve a mystery within the lab. Maybe they discover a hidden project that could change the future of the lab rats. Another plot could be a love triangle situation where Taylor has feelings for Leo, but Leo is focused on his friendship with the lab rats and their missions.
One idea could be a crossover with another popular sci - fi show. For example, the bionic heroes from Lab Rats team up with characters from a time - traveling show to stop an evil force that's using time - travel to change history and make bionics illegal. This would create a lot of interesting dynamics as they try to figure out how to work together.
One idea could be a crossover where the characters from Shake It Up end up in the world of Lab Rats. Maybe they get accidentally transported to the bionic academy and have to learn how to adapt to the high - tech environment while also trying to find a way back home. The dancers from Shake It Up could teach the bionic kids some new moves, and in return, the bionic kids could show off their super - cool abilities.
One idea could be a crossover where the characters from both shows team up to fight a common enemy. Maybe a super - villain that is too powerful for either group alone.
Some ideas for Lab Rats crossover fanfiction include a crossover with 'The Flash'. The super - speed of The Flash could be compared and contrasted with the bionic abilities of the Lab Rats. They could race each other or work together to stop a speed - based villain. Another could be a crossover with 'Stranger Things'. The Lab Rats could find themselves in the Upside Down and have to use their bionic powers to survive and find a way out. And a crossover with 'Avatar: The Last Airbender' would be interesting. The Lab Rats could learn about bending and incorporate some of those elements into their fighting styles while helping Aang and his friends on their quest.
One idea could be that the lab rats discover a new device in the lab that, when activated, causes uncontrollable tickling sensations. They have to figure out how to turn it off while also having some humorous interactions with each other as they're being tickled.
One idea could be that the Lab Rats and Elite Force have to team up to stop a new super - villain who has technology that can neutralize their powers. They start off distrusting each other but as they face challenges together, they learn to work as a cohesive unit.
One interesting plot idea could be Donald and Tasha teaming up to solve a mystery within the lab. Maybe some of the bionic technology is going missing and they suspect an inside job. Another could be a story where Tasha helps Donald deal with his insecurities regarding his role in the lab. For example, he might feel that he's not as important as the bionic kids and Tasha could show him how valuable he really is.