Guest Stars Jeff Bennett voices Choose Goose Hynden Walch voices Princess Bubblegum Steve Little voices Peppermint Butler Bex Taylor-Klaus voices Blaine Tom Kenny voices Berdzerd Edi Patterson voices Momdebra Edi Patterson voices Cat Student Anthony Stewart Head voices Con Wizard Duncan Trussell voices Ron James Bill Hader voices Bufo Toks Olagundoye voices Dr. Caledonius Julia Butters voices Larry Maurice LaMarche voices Wizard Cop #1 Maurice LaMarche voices Skull Dana Snyder voices Life Giving Magus Dana Snyder voices Potable Wizard Steve Little voices Abracadaniel Patti Harrison voices Weapon Head Chloe Coleman voices Cadebra SungWon Cho voices Wizard Cop #2 SungWon Cho voices Brain Wizard Cole Sanchez voices Little Dude John Omohundro voices Spader Sheng Wang voices Dimension Wizard Co Starring John DiMaggio voices Additional Voices Tom Kenny voices Additional Voices Jeremy Shada voices Additional Voices Pendleton Ward voices Additional Voices Niki Hyun Yang voices Additional Voices Cole Sanchez voices Additional Voices Jeff Bennett voices Additional Voices Bex Taylor-Klaus voices Additional Voices Julia Butters voices Additional Voices SungWon Cho voices Additional Voices