The Amazing World of Gumball

Regular Show


 * Mordecai,Hi Five Ghost, and Rigby make quick Cameo appearances the episode, the Boredom.

Uncle Grandpa


 * near the end of the episode, Pizza Eve Gumball is seen at the grampies.


 * In the episode, the Boredom Uncle Grandpa and Pizza Steve make appearances.

Clarence


 * In the episode, the Boredom Clarence and his mom is seen outside his window.