Suggestions by @kieranhealy

Teagan Croft

as Mallory Grace in The Spiderwick Chronicles (TV Series Adaptation)

Danny McBride

as Hogsqueal (voice) in The Spiderwick Chronicles (TV Series Adaptation)

Jim Carrey

as Ant Man in Avengers Endgame if it was made in the 80’s

Kevin Costner

as Hawkeye in Avengers Endgame if it was made in the 80’s

Christina Applegate

as Captain Marvel in Avengers Endgame if it was made in the 80’s

Tim Curry

as Thanos in Avengers Endgame if it was made in the 80’s

Michael J. Fox

as Peter Parker in Avengers Endgame if it was made in the 80’s

Sylvester Stallone

as Bruce Banner in Avengers Endgame if it was made in the 80’s

Nicolas Cage

as Captain America in Avengers Endgame if it was made in the 80’s

Harrison Ford

as Tony Stark in Avengers Endgame if it was made in the 80’s

Joan Jett

as Nebula in Guardians of the Galaxy (1984)

Vanity

as Gamora in Guardians of the Galaxy (1984)

Don Rickles

as Rocket in Guardians of the Galaxy (1984)

Sean Connery

as Groot in Guardians of the Galaxy (1984)

Kevin Bacon

as Peter Quill / Star-Lord in Guardians of the Galaxy (1984)

Kim Basinger

as Vicki Vale in Tim Burton's Batman Forever

Dane DeHaan

as Leonardo Dicaprio in Celebrity Biopics

Jeremy Irons

as Count dooku in Star Wars alternate prequels

Ian McDiarmid

as Palpatine in Star Wars alternate prequels

Taimak

as Jango Fett in Star Wars alternate prequels