Who played the shy science teacher on the 1950s U.S. sitcom "Mister Peepers"?

I remember him from the animated TV series "Underdog" as well as his appearance on The Twilight Zone.

Also the voice of the underdog cartoon too!!

I remembered reading about him after his death from his wife. She greatly steamed him and loved him very much. He was very kind and gentle, she said.

Refik, The TLZ episode where he played a computer programmer & the computer had a female personality & was in love with him? Great story, science fiction back then, eerily close to reality today with AI.

joey, Esteemed.

Player #98883546, what does that mean she greatly steamed him

TWeezyA, yes. He played a hit man in a Man From Uncle episode.

miss him now!!