Suggestions by @ltathena

Margaret Tyzack

as Prof. Elena Chandra in 2001: A Space Odyssey

Leonard Rossiter

as Dr. Andrei Smyslov in 2001: A Space Odyssey

Daniel Richter

as Moonwatcher in 2001: A Space Odyssey

Jacqueline Bisset

as SAL 9000 in 2001: A Space Odyssey

William Sylvester

as Dr. Heywood Floyd in 2001: A Space Odyssey

Gary Lockwood

as Dr. Franklin Poole in 2001: A Space Odyssey

Jean Seberg

as Dr. Dale Bowman in 2001: A Space Odyssey

Susan Roman

as James the Red Engine in Four Little Engines

Maurice LaMarche

as James the Red Engine in Four Little Engines

Joanna Lumley

as Henry the Green Engine in Four Little Engines

Monica Rial

as Henry the Green Engine in Four Little Engines

Neil Crone

as Gordon the Big Engine in Four Little Engines

Ron Rubin

as Edward the Blue Engine in Four Little Engines

Dave Bautista

as Tigerman in Buck Rogers In The 25th Century

Christopher Eccleston

as Seton Kellogg in Buck Rogers In The 25th Century

Hugh Jackman

as Draco the Conqueror in Buck Rogers In The 25th Century

Priyanka Chopra Jonas

as Princess Ardala Valmar in Buck Rogers In The 25th Century

Tom Hiddleston

as Killer Kane in Buck Rogers In The 25th Century

Billy West

as Doctor Theopolis in Buck Rogers In The 25th Century

Peter Dinklage

as Twiki the Ambuquad in Buck Rogers In The 25th Century