Suggestions by @amitylee

Billy Dee Williams

as Harvey Dent (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Tony Todd

as Victor Fries (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Ken Watanabe

as Hugo Strange in DC's Batgirl: The Long Halloween (HBO Max)

Florence Kasumba

as Jane Doe (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Mark Hamill

as Joker (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

David Tennant

as Edward "Eddie" Nygma (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Danny DeVito

as Oswald Cobblepot (Patient at Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Cillian Murphy

as Jonathan Crane (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Danielle Rose Russell

as Alexis Kaye (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

John Travolta

as Lazlo Valentin (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Terry Crews

as Raymond "Ray" Salinger (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Marco Barricelli

as Arnold Etchison (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Manny Montana

as Judson Caspian (Patient in Arkham Asylum) in DC's Batgirl: The Long Halloween (HBO Max)

Dave Bautista

as Cyrus Gold in DC's Batgirl: The Long Halloween (HBO Max)

Helena Bonham Carter

as Alberta Falcone in DC's Batgirl: The Long Halloween (HBO Max)

Michael Fassbender

as Julian Day in DC's Batgirl: The Long Halloween (HBO Max)

Michelle Pfeiffer

as Selina Kyle in DC's Batgirl: The Long Halloween (HBO Max)

Michael Keaton

as Bruce Wayne in DC's Batgirl: The Long Halloween (HBO Max)

María Pedraza

as Ricki Gutierrez in DC's Batgirl: The Long Halloween (HBO Max)

Jeffrey Wright

as James "Jim" Gordon in DC's Batgirl: The Long Halloween (HBO Max)