Meaning Heathcliff the plump orange tabby who was always in Garfield's shadow, of course. Is there another Heathcliff? ;) Variety reports that he's getting his own live action film! I still remember the lyrics to his theme song.
However, I personally loved Riff-Raff (above) and Cleo the most, so this news is bittersweet. They were the other cats on Heathcliff's half-hour cartoon show, the ones who would only show up at the very end and didn't actually exist in the comics.
For some reason they lived in a junkyard -- and yet Riff-Raff wore a beret and a scarf. Although looking at images of him now, I realize it was a baseball cap. Why did I think it was a beret? Why did I even know the word beret when I was in 3rd grade?
Also: how did Riff-Raff ever in a million years get slinky Cleo for a girlfriend...cat...thing? And why were they all ORANGE?