You Know The Voice(s): It's easier to pick who didn't work in cartoons on Match Game (1974)

 2/3 of the panel in this July 1974 episode of Match Game had or later would land some voice-over gigs. To wit:

Mitzi McCall voiced Penny Pillar on Pebbles & Bamm-Bamm and The Flintstone Comedy Hour (1972-4).

Don Adams (ex-Tennessee Tuxedo, later Inspector Gadget).

Richard Dawson made his toon debut in Oliver & The Artful Dodger (1972).

Charles Nelson Reilly (ex-Lidsville, Ghost & Mrs. Muir) made his toon debut in The City That Forgot About Christmas.