Space Ghost is terminally ill and will die when the show ends, but no-one see...
Space Ghost Coast to Coast
Season 5 Episode 6: Warren (short version)
Space Ghost grows angry upon learning that he has been 'imposternated' on Warren's television program, so he goes with Moltar and Zorak to confront him. Warren is actually a very bitter bush. We then meet an evil replica of Space Ghost, or is it Gary Owens...(this is the short version, which does not loop 3 times)