Midway through the show, after frustrations of being crippled, Flynn gets Louis to design him a set of robotic legs. As we know from BB, Louis 'is good with computers' and helped him set up . So obviously Louis is a tech savvy hacker character. And him and Walt Jr (now a cyborg) take on the DEA in a sort of Robocop meets Terminator fashion, after the DEA find out where his money came from and seize his assets.
It's called Flynn; Heisenberg's Son. Because of a naming copyright issue in the U.K., the series will be known as "You're G-g-g-oddamn R-right" in European markets.
Things come to a head in Season 4, after RoboFlynn, Louis, and Holly (a superbaby, ala The Incredibles, after she gets into a stash of the ol blue meth) have destroyed the entire DEA, and there's only one person left who can stop them; Marie. She had a radiation accident with all of Hank's minerals, and it turned her into a giant purple crystallic monster, ala Marvel's the Thing. Donning the alias, The Color Purple, she defeats our trio.
Holly is taken to a government compound, Louis is killed, and Flynn's robot legs are blown off, and he's missing, presumed dead.
It's season 5, the final season. It's revealed that Flynn is alive, albeit without legs, and has been hiding out in Nebraska, with a griseled Saul Godman. The dying Godman nurses him back to health, and just before he dies, tells him that he's not the only BB character still alive, there is another. Our legless Flynn crawls all the way back to Albuquerque and finds Huell still in the safehouse. After escaping, Huell takes Flynn upon his shoulders, like Yoda and Chewie at the end of Ep.3 and they head for Marie's.
They get to Marie's and find her sleeping. Flynn feels like it'd be a cheap kill to just kill her in her sleep like that. But Huell says "Aw Come on man, I got to, I gots to do it". He then proceeds to lay down on her, crushing her to death by his enormous weight.
Walt Jr. wakes up. It was all a dream. At breakfast, He describes it all to his dad who just responds "heh"...
FIN