Underpants is the name of Entrèe's first clone, alongside Peri's clone, Ponty. Entrèe's plan was to make two clones of themselves so that whilst the original pair can play Bucket stick fruit ball and the other two copy clones try out Patricia's pies. When Peri and Entrèe discover that they are not the ones eating pies, they confront the clones and request them to switch. However, the two copies did not care much about their originals.
Underpants is one of the two main villains of the cartoon Spliced! in the episode Clones Don't Care 'Bout Nothin' Either