Suggestions by @dantedixon

Tanya Roberts

as Princess Aurora in The Empire Strikes Back (1975)

Rob Reiner

as Jim Hawkins in The Empire Strikes Back (1975)

Bill Bixby

as Sam Wilson in The Empire Strikes Back (1975)

Tony Jay

as Jason Voorhees in The Empire Strikes Back (1975)

John Candy

as B.E.N. in The Empire Strikes Back (1975)

Robert Downey Jr.

as Dr. Stark in Alvin Little (1995)

Jodi Benson

as Ariel Little in Alvin Little (1995)

Kenneth Branagh

as Cousin Miguel in Alvin Little (1995)

Kevin Kline

as Cousin Tulio in Alvin Little (1995)

Tony Jay

as Shere Khan in Alvin Little (1995)

FAKE

as Shere Khan in Alvin Little (1995)

Tara Strong

as Spike the Dog in Lapis Lazuli (1993)

John Lithgow

as Gov. Farquaad in Lapis Lazuli (1993)

Corey Burton

as Gaetan Molière in Lapis Lazuli (1993)

Phil Morris

as Joshua Sweet in Lapis Lazuli (1993)

Michael J. Fox

as Milo James Thatch in Lapis Lazuli (1993)

Jeffrey Tambor

as Cheif Neptune in Lapis Lazuli (1993)

Frank Welker

as Blu in Lapis Lazuli (1993)

Chris Wedge

as Scrat in Lapis Lazuli (1993)

Cree Summer

as Kida Nedakh in Lapis Lazuli (1993)