Suggestions by @kieranhealy

Benedict Cumberbatch

as Dr Steven Strange in Doctor Strange In The Multiverse of Madness

Madhuri Bhattacharya

as Sharon Osbourne in Prince of Darkness

John Glover

as Lemmy Kilmister in Prince of Darkness

Bill Hader

as Ozzy Osbourne in Prince of Darkness

Jim Carrey

as Folk-Ka-Yew in Guardians of the Galaxy Vol. 3

Alan Silvestri

as Composer in Doctor Who (US)

James Gunn

as Director in Doctor Who (US)

Steve Buscemi

as Dalek in Doctor Who (US)

Andy Samberg

as Jack Harkness in Doctor Who (US)

Danny McBride

as The Master in Doctor Who (US)

Emma Stone

as Amy Pond in Doctor Who (US)

Kristen Wiig

as Donna Noble in Doctor Who (US)

Zoe Saldaña

as Martha Jones in Doctor Who (US)

James Franco

as The Eleventh Doctor in Doctor Who (US)

Michael B. Jordan

as Mickey Smith in Doctor Who (US)

Jim Carrey

as The Tenth Doctor in Doctor Who (US)

Chloë Grace Moretz

as Rose Tyler in Doctor Who (US)

Nicolas Cage

as The Ninth Doctor in Doctor Who (US)

Elizabeth Olsen

as Tara Maclay in Buffy the Vampire Slayer (2012-2018)

Chloë Grace Moretz

as Buffy Summers in Buffy the Vampire Slayer (2012-2018)