Penn Zero

Thomas Middleditch

Sashi Kobayashi (voice)

Tania Gunadi

Boone

Adam Devine

Rippen

Alfred Molina

Principal Larry

Larry Wilmore

Lady Starblaster

Sigourney Weaver

The Snowman

Henry Winkler

Sheriff Scaley Briggs

Beau Bridges

The Judge

Chris Parnell

Shirley B. Awesome

Wanda Sykes

The President

Maria Bamford

Coach Wallace

Jason Alexander

Drab Lieutenant

Pamela Adlon

Hogarth

Blake Anderson

Alien Princess

Elizabeth Henstridge

Rodeo Clown Announcer

Jeff Gordon

Rufus

Peter Stormare

Phyllis (voice)

Sam Levine

The Milk Man

Paul Reubens

Himself

Bruce Vilanch

Soda Jerk

Garry Marshall

Coach Jackie

Jane Kaczmarek

Vonnie (voice)

Lea Thompson

Blaze

Sean Astin

Captain Super Captain

Adam West

Mike

John Anderson

Brock (voice)

Gary Cole

Ron

John Henson

Aunt Rose (voice)

Rosie Perez

Uncle Chuck (voice)

Lenny Venito

Amber

Olivia Holt