I felt kinda bad for Adam West...
I can recall three times when he voiced a character refusing to let go of one acting job.
Johnny Bravo, he basically played himself but as a crime fighter (batman anyone?)
Kim possible, he voiced Timothy North a man who lost his mind and thought he was his character the fearless ferret (a feretty batman)
BTAS, he voiced simon trent a washed-up penniless actor he couldn't get jobs anymore after being typecast as The Gray Ghost a TV crimefighter. (batman)
Notice a pattern, it must've felt so demeaning to basically play himself but in a negative typecast way.