Conversation so far:
What roles did Danny DeVito play on television?
Danny Devito has played Louie de Palma on Taxi, SNL, Friends, and It's Always Sunny in Philadelphia
What was some voice over work that Danny DeVito has done?
Danny Devito has done voice work in My Little Pony: The Movie, The Earth Day Special, The Simpsons, Space Jam, and Hercules, The Lorax
When did Danny DeVito start acting on television?
In 1977, DeVito played the role of John John John the Apple DeAppoliso in the Starsky & Hutch episode The Collector

Question: When did he start voice over work?
Self-contained rewrite: When did Danny DeVito start voice over work?