Speaking of which, Incredible Hulk was one of the few famous Marvel comics that Mantlo wrote over his career, the other ones being Amazing Spider-Man, Avengers, Captain America, Daredevil, Fantastic Four, Ghost Rider, Howard the Duck, Iron Man, Spectacular Spider-Man (again), Thor, Transformers, and X-Men. (Get it? I said "few," but it was "all of them.") He was also pretty good at taking random toys with no backstory and writing the equivalent of several Lord of the Rings-length novels about them. Remember the Micronauts?
Mantlo saw his son playing with those things on Christmas 1977 and thought, "Someone should make dozens and dozens of awesome comics out of that." So he convinced Marvel to buy the licensing rights and became that someone. The comic was a hit and outlived the toy line by years. The same thing happened with ROM: SpaceKnight -- no one gave a crap about the toy, but everyone loved Mantlo's inexplicably good, 75-issue comic saga about it. In 1988 he wrote one of DC's best crossovers, Invasion!
In 1992 he was struck by a hit-and-run driver and left with permanent brain damage, in need of constant medical care for the rest of his life. In 1995 he wrote his last story as his mind slowly slipped away from him.