Suggestions by @mamtagupta1

Adam Sandler

as Fred Jones in Scoob! (1995)

Jennifer Aniston

as Velma Dinkley in Scoob! (1995)

Thomas Haden Church

as Shaggy Rogers in Scoob! (1995)

Frank Welker

as Scooby Doo in Scoob! (1995)

Rajiv Surendra

as Mason in Mr. Peabody and Sherman (2004)

Robin Thicke

as Stinky Peterson in Hey Arnold! (1986-1994)

Fred Savage

as Eugene Horowitz in Hey Arnold!: The Movie (1992)

Kate Beckinsale

as Rhonda Wellington Lloyd in Hey Arnold!: The Movie (1992)

Rip Torn

as Scheck in Hey Arnold!: The Movie (1992)

Billy West

as Dr. Heinz Doofenshmirtz in Phineas and Ferb (1997-2005)

Dan Povenmire

as Dr. Heinz Doofenshmirtz in Phineas and Ferb (1997-2005)

Frank Welker

as Perry The Platypus in Phineas and Ferb (1997-2005)

Dee Bradley Baker

as Perry The Platypus in Phineas and Ferb (1997-2005)

Kieran Culkin

as Phineas Flynn in Phineas and Ferb (1997-2005)

Terrence Hardiman

as Lawrence Fletcher in Phineas and Ferb (1997-2005)

Nora Dunn

as Linda Flynn-Fletcher in Phineas and Ferb (1997-2005)

Kal Penn

as Baljeet Tjinder in Phineas and Ferb (1997-2005)

Tom Kenny

as Buford Van Stomm in Phineas and Ferb (1997-2005)

Grey DeLisle

as Candace Flynn in Phineas and Ferb (1997-2005)

Eddie Redmayne

as Ferb Fletcher in Phineas and Ferb (1997-2005)