Cook started his career on radio. He played Little Beaver on the radio series
Red Ryder. He also played Alexander on
Blondie and Junior on
The Life of Riley. He had a starring role in the 1950 American drama film
The Vicious Years. On television, Cook appeared in a 1961 episode of
The Tab Hunter Show. He had
voice-over roles on animated series such as
Kid Flash on
The Superman/Aquaman Hour of Adventure, Augie on
The Funky Phantom and Biff on
Jabberjaw. Cook returned to acting in 2017, making guest appearances on
Better Things and
Space Force. This means that his acting career in Hollywood now spans over 80 years. ==Military service==