Suggestions by @mikeysplace

Danny Glover

as Officer Duncan K. Horton in Doodles

Doug E. Doug

as Officer Duncan K. Horton in Doodles

Joe Morton

as Officer Duncan K. Horton in Doodles

Don Cheadle

as Officer Duncan K. Horton in Doodles

Stuart Pankin

as Horace Horvitz in Doodles

Paul "Big Show" Wight

as Claudius in Doodles

Arthur Burghardt

as Claudius in Doodles

Kevin Clash

as Louis "Lou" Primate in Doodles

Frank Oz

as Louis "Lou" Primate in Doodles

Michael Bell

as Louis "Lou" Primate in Doodles

Marla Sokoloff

as Celeste in Doodles

Alicia Silverstone

as Celeste in Doodles

Britney Spears

as Celeste in Doodles

Judy Greer

as Celeste in Doodles

Tara Reid

as Celeste in Doodles

Anndi McAfee

as Celeste in Doodles

Francesca Marie Smith

as Celeste in Doodles

Christina Applegate

as Celeste in Doodles

Willa Ford

as Celeste in Doodles

Drew Barrymore

as Celeste in Doodles