The Stunt Double
From Homestar Runner Wiki
Strong Bad's stunt double (played by Strong Sad) was hurt various times in Dangeresque II: This Time, It's Not Dangeresque I, in spite of Strong Bad's obviously false claims that he himself did all the stunts. He also played Strong Mad's stunt double in Dangeresque One: Dangeresque Too? in addition to his work as Hot Tub. He plays a stunt double for both Strong Bad and Homestar Runner at various times in Dangeresque 3: The Criminal Projective. Stunt doubles for Marzipan and Coach Z are in the same movie, but are respectively played by Cardboard Marzipan and a plant, not Strong Sad. Interestingly, this Strong Sad variation doesn't have a belly button.
 Complete Filmography
Dangeresque 1: Dangeresque, too?, Dangeresque 2: This Time, It's Not Dangeresque 1,
Strong Bad: Dangeresque