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K-9 is Marvin the Martian's pet alien dog. K-9 debuted in the short "Haredevil Hare", where he and his owner Marvin tried to thwart Bugs Bunny, who had stumbled on the pair's plans to destroy the Earth.
In his debut short, "Haredevil Hare", he seems quite unintelligent and gullible. This changes in later shorts where K-9 carries an air of superiority over his owner. In "K-9 Kaddy", K-9 proves to be ticklish when two alien gophers tickle his belly and chin with feathers.
- His debut cartoon, "Haredevil Hare" was the only one sold to Associated Artists Productions.
The Duck Dodgers episodes:
The Pinky and the Brain episode:
- "Star Warners" (cameo)
The Sylvester & Tweety Mysteries episode:
The video games:
- Bugs Bunny in Double Trouble
- Looney Tunes: Space Race
- Looney Tunes Collector: Alert!
- Looney Tunes: Marvin Strikes Back!
- Looney Tunes: Back in Action: The Video Game
- Looney Tunes World of Mayhem