Suggestions by @maxhedroom

Madonna

as Harley Quinn in Batman: 1980s

Alec Baldwin

as Hush in Batman: 1980s

Geena Davis

as Poison Ivy in Batman: 1980s

Arnold Schwarzenegger

as Bane in Batman: 1980s

Pat Hingle

as James Gordon in Batman: 1980s

Pierce Brosnan

as Black Mask in Batman: 1980s

Brad Dourif

as Scarecrow in Batman: 1980s

Michael Gough

as Alfred in Batman: 1980s

Robin Williams

as The Riddler in Batman: 1980s

Michelle Pfeiffer

as Catwoman in Batman: 1980s

Kevin Peter Hall

as Killer Croc in Batman: 1980s

Christopher Lloyd

as Mister Freeze in Batman: 1980s

Jack Nicholson

as The Joker in Batman: 1980s

Danny DeVito

as The Penguin in Batman: 1980s

Stacy Keach

as Jayne Cobb in Firefly (1970s)

Raquel Welch

as Inara Serra in Firefly (1970s)

Sondra Locke

as Kaywinnet Lee "Kaylee" Frye in Firefly (1970s)

Jane Seymour

as Inara Serra in Firefly (1970s)

Christopher Reeve

as Simon Tam in Firefly (1970s)

Richard Gere

as Simon Tam in Firefly (1970s)