Suggestions by @benanderson

Michael Shannon

as Nicholson’s Joker in Almost Cast: The Jokers

Robert Pattinson

as Leto's Joker in Almost Cast: The Jokers

David Tennant

as Ledger’s Joker in Almost Cast: The Jokers

Jaimie Alexander

as The Sirens in O Brother, Where Art Thou? (2020)

The Blind Boys of Alabama

as The Gravediggers in O Brother, Where Art Thou? (2020)

The Chicks

as The Sirens' Singing Voices in O Brother, Where Art Thou? (2020)

Alyssa Sutherland

as The Sirens in O Brother, Where Art Thou? (2020)

Lauren Cohan

as The Sirens in O Brother, Where Art Thou? (2020)

Stephen McKinley Henderson

as The Blind Seer in O Brother, Where Art Thou? (2020)

Brian Baumgartner

as Mr. Lund in O Brother, Where Art Thou? (2020)

Jack Black

as Baby Face Nelson in O Brother, Where Art Thou? (2020)

Pablo Schreiber

as Wash Hogwallop in O Brother, Where Art Thou? (2020)

Hamish Linklater

as Vernon T. Waldrip in O Brother, Where Art Thou? (2020)

Mark Povinelli

as The Little Man in O Brother, Where Art Thou? (2020)

Paul Giamatti

as Homer Stokes in O Brother, Where Art Thou? (2020)

Tommy Lee Jones

as Sheriff Cooley in O Brother, Where Art Thou? (2020)

Cameron Britton

as Junior O'Daniel in O Brother, Where Art Thou? (2020)

Brendan Gleeson

as Pappy O'Daniel in O Brother, Where Art Thou? (2020)

Vincent D'Onofrio

as Big Dan Teague in O Brother, Where Art Thou? (2020)

Jessica Chastain

as Penny Wharvey-McGill in O Brother, Where Art Thou? (2020)