the Batman: the Animated Series Clayface motivation is so goofy
Clayface: Oh no I'm grotesque, I'll never act again!
Clayface's "friend": But look! You're transforming, just by instinct!
Clayface: Yes.. yes! My life is back!
Clayface's "roommate": Hooray!
Clayface: Oh no, you broke my concentration and I went back to being grotesque! My dreams are shattered once again!
But like... he's a film actor. It's a medium defined by only needing to look right for a seconds at a time, maybe five minutes for a really long take. We see in the next scene that he's already able to hold a shape that long, and that's with zero practice. Treat it like physical therapy, like building a muscle back up, and he could easily build stamina. Not only that, but he's a walking talking special effects bonanza! If he weren't a total idiot, he could be the highest-grossing actor in Hollywood history.
