Clyde is a racehorse who is Marvin's younger brother (even though he is now bigger than Marvin). He appeared in "Marvin Keeps Track". He and Marvin used to do great things together when they were young and Marvin was always the winner, but now Clyde always beats Marvin or rather creams him. Marvin was not pleased to see him because he had forgotten all about their past and all Clyde wants to race, but then Clyde reminded him. So if it wasn't for Marvin, Clyde would have never been a racehorse. He also tells Marvin that unlike his brother, he cannot dance and Marvin is great at telling stories.
Clyde and Marvin are brothers to one another, despite Marvin getting annoyed at him sometimes and jealous of the fact that Clyde is better at racing than him. Clyde also makes friends with Marvin's gang as he is good to them too.
Clyde will make more appearances in future productions, episodes, trailers, promotional tie ins, TV bumpers and creations.