Does anyone remember the My Favorite Martian cartoon from the 70's? Ray Walston, did the voice. I don't know if there was a Tim O'Hara, but there was an Andy.

The cartoon was actually "My Favorite Martians". Ray Walston was not involved, the voice of Martin O'Hara was supplied by Jonathan Harris, the same guy who portrayed Dr. Zachary Smith in "Lost in Space". There was a Tim O'Hara and his voice was done by Howard Morris, the same guy who portrayed Earnest T Bass on "The Andy Griffith Show".

Both of these guys do a lot of cartoon voices.

Geez, I'd kind of like to see this cartoon.