Childrens Hospital

Ken Marino

Glenn Richie

Rob Huebel

Owen Maestro

Rob Corddry

Blake Downs

Lake Bell

Cat Black

Erinn Hayes

Lola Spratt

Megan Mullally

Chief

Michael Cera

Sal Viscuso

Zandy Hartig

Nicky's Mom

Malin Akerman

Valarie Flame

Henry Winkler

Sy Mittleman

Brian Huskey

Chet

Beth Dover

Nurse Beth

David Wain

Rabbi Jewy McJewJew

Nick Offerman

Chance Briggs

Jordan Peele

Dr. Brian

Kulap Vilaysack

Sandy

Seth Morris

Nate Schachter

Nick Kroll

Little Nicky

Jamie Denbo

Jamie Denbo

Jon Hamm

Derrick Childrens / Arthur Childrens

Ed Helms

TV Announcer (voice)

Nate Corddry

Dr. Nate Corddry

Paul Scheer

Sir Tinkle Button

John Ross Bowie

Dr. Max Von Sydow

Mather Zickel

Louis La Fonda

Carly Craig

Catlike Doctor

Elizabeth Ann Koshak

Dr. Izzy (uncredited)

Ryan Berg

Hospital Administrator

Abigail Spencer

Maxine Spratt

Whitney Teubner

Whitney

Ian Roberts

Soldier 1

Keegan-Michael Key

Cop

James Adomian

Madonna

Jason Sudeikis

Bobby Fiscus

Joe Lo Truglio

Shane

Anne-Marie Johnson

Dr. Parker

Taylor Lipman

Young Cancer Patient

A.D. Miles

Administrator - Ribbon Cutter

Laura Marano

Haley

Lei'lah Star

Sick Girl in Creches (uncredited)