Ranma gets a bit more of a training journey then he originally wanted.
While chasing Genma just after both had been cursed, Dr Who's TARDIS materializes at Jusenkyo. Colliding with Ryoga, both Ranma and Ryoga fall into it and Ranma accidentally sends it on its way. In the future Ranma is shot and falls, on fire, as Ryoga and the Doctor make their escape. Ranma survives, and spends the next 200 years as a gladiator fighter before finally making it home again. Of course he doesn't go home alone, one of his enemies is following...
There have been claims that Ranma is one of the best martial artists in his generation, and what if that were so.