Sidney (voiced by Stan Freberg) is a dinosaur who adapted to life in the modern world.
Sidney previously made up his own children's television show, with himself painted pink for a friendlier appearance. He managed to put viewers under his "bad is not good" spell to conquer the earth. When Jon and Odie are among those hypnotized, Garfield goes out to foil Sidney's plot. Afterward, the dinosaur redeems himself and becomes a movie star.
- Despite enjoying his new life as a movie star, Garfield comments that Sidney does not know what a camera is.
- Sidney's television show is a parody of Barney & Friends.