Michael Showalter
Coop / Alan Shemper
Michael Ian Black
McKinley
Kevin Thomas Conroy
Mork Guy
Christopher Cusumano
Medieval Kid
Cassidy Ladden
Mallrat Girl
H. Jon Benjamin
Can of Vegetables (voice)
Ian Helfer
Bear Claw Coach
Kyle Gallner
Bobby's Buddy
Kathleen Pandolfo
Godspell Girl
Zachary Montgomery-Wicks
Gail's Boy Camper
Danny Hopkins
Raft Camper #1
Christopher Connors
Raft Camper #2
Stephen O'Brien
Juke Box Kid #1
Timothy Gasiewski
Juke Box Kid #2
Angel Berlane
Friends, Friends Girl #1
Christi Berlane
Friends, Friends Girl #2
Joseph Kariuki
Kenyan Runner
Donna Mitchell
Gene's Wife
Christine Loebsack
Counselor
Samm Levine
Arty (voice) (uncredited)