Janeane Garofalo as Beth

David Hyde Pierce as Henry

Michael Showalter as Coop / Alan Shemper

Marguerite Moreau as Katie

Paul Rudd as Andy

Zak Orth as J.J.

Christopher Meloni as Gene

A.D. Miles as Gary

Molly Shannon as Gail

Gideon Jacobs as Aaron

Ken Marino as Victor

Joe Lo Truglio as Neil

Michael Ian Black as McKinley

Liam Norton as Arty

Amy Poehler as Susie

Bradley Cooper as Ben

Marisa Ryan as Abby

Elizabeth Banks as Lindsay

Gabriel Millman as Caped Boy

Kevin Sussman as Steve

Kevin Thomas Conroy as Mork Guy

Christopher Cusumano as Medieval Kid

Cassidy Ladden as Mallrat Girl

Madeline Blue as Cure Girl

Nina Hellman as Nancy

Peter Salett as Guitar Dude

Judah Friedlander as Ron

Jacob Shoesmith Fox as Moose

Whitney Vance as Valerie

Benjamin Coppola as Bobby

H. Jon Benjamin as Can of Vegetables (voice)

Jake Fogelnest as Silas

Ian Helfer as Bear Claw Coach

Jordan MacLean as Alexa

Avi Setton as Standup Comic

Kyle Gallner as Bobby's Buddy

Kathleen Pandolfo as Godspell Girl

Zachary Montgomery-Wicks as Gail's Boy Camper

Danny Hopkins as Raft Camper #1

Christopher Connors as Raft Camper #2

Matt Carmeci as Bunk Boy

Stephen O'Brien as Juke Box Kid #1

Timothy Gasiewski as Juke Box Kid #2

Angel Berlane as Friends, Friends Girl #1

Christi Berlane as Friends, Friends Girl #2

Bob Walz as Drug Dealer

Joseph Kariuki as Kenyan Runner

Donna Mitchell as Gene's Wife

Joe Bryan as Counselor

Christine Loebsack as Counselor

Sandra Kennedy as Counselor

Dan Klein as Jeremy

Samm Levine as Arty (voice) (uncredited)

Keith Oney as Counselor

Joe James as Junkie Squatter (uncredited)