Aubrey Plaza as Grumpy Cat / Aubrey Plaza

Megan Charpentier as Chrystal

Daniel Roebuck as George

David James Lewis as Mr. Crabtree

Russell Peters as Santa

Isaac Haig as Donny

Evan Todd as Zack

Shauna Johannesen as Tabby

Casey Manderson as Jesse

Stephen Stanton as Jojo (voice)

Trevor Lissauer as Jacky (voice)

Veronica Alicino as Carla / Colette

Trevor Devall as Wilson (voice)

Chris Williams as Lance the Hamster (voice)

Tyler Johnston as Gill Brockman

Ryan Beil as Corbin

Tasya Teles as Nicole

Sergio Osuna as Alejandro

Sidika Larbes as Mom

Dylan Poyser as Little Boy

Jay Brazeau as Roger

Graeme Duffy as Photographer

Jean Hamilton as Old Lady