Of the five main characters on this show, four of them appeared in Duck Dodgers in the 24½th Century (1953): Daffy Duck (Duck Dodgers), Porky Pig (The Eager Young Space Cadet), Marvin the Martian (Martian Commander X-2), and Dr. I.Q. Hi (Himself). However, the fifth major character, The Martian Queen, was created specifically for the series.
Uh, c-can I put my clothes back on? My n-n-nipples are getting cold.
The opening titles credit the "starring" Looney Tunes like human actors: "Starring Daffy Duck as Duck Dodgers", "Porky Pig as The Eager, Young Space Cadet" and "Marvin the Martian as The Martian Commander".