Louis C.K. as Max (voice)

Eric Stonestreet as Duke (voice)

Kevin Hart as Snowball (voice)

Jenny Slate as Gidget (voice)

Ellie Kemper as Katie (voice)

Albert Brooks as Tiberius (voice)

Lake Bell as Chloe (voice)

Dana Carvey as Pops (voice)

Hannibal Buress as Buddy (voice)

Bobby Moynihan as Mel (voice)

Chris Renaud as Norman (voice)

Steve Coogan as Ozone / Reginald (voice)

Michael Beattie as Tattoo (voice)

Sandra Echeverría as Maria (voice)

Jaime Camil as Fernando (voice)

Kiely Renaud as Molly (voice)

Tara Strong as Additional Voices (voice)

Jason Marsden as Additional Voices (voice)

Mona Marshall as Additional Voices (voice)

Brian T. Delaney as Additional Voices (voice)

Bill Farmer as Additional Voices (voice)

Jan Rabson as Additional Voices (voice)

Ken Schretzmann as Additional Voices (voice)

John Kassir as Additional Voices (voice)

Danny Mann as Additional Voices (voice)

Jim Ward as Additional Voices (voice)

Tyler Werrin as Additional Voices (voice)

Bob Bergen as Additional Voices (voice)

Jim Cummings as Additional Voices (voice)

Jess Harnell as Additional Voices (voice)

Laraine Newman as Additional Voices (voice)

Dee Bradley Baker as Additional Voices (voice)