Suggestions by @moviefan449

Margot Robbie

as Harley Quinn (DCEU) in Batman: Into the Batverse

Jeffrey Dean Morgan

as Batman (Flashpoint) in Batman: Into the Batverse

Willem Dafoe

as The Batman who Laughs in Batman: Into the Batverse

Will Forte

as Shaggy (Voice) in TMNT/Scooby-Doo

Frank Welker

as Scooby-Doo (Voice) in TMNT/Scooby-Doo

Zac Efron

as Fred (Voice) in TMNT/Scooby-Doo

Jeremy Irons

as Alfred Pennyworth (DCEU) in Batman: Into the Batverse

Kate Beckinsale

as Catwoman (DCEU) in Batman: Into the Batverse

Robert Pattinson

as Batman (Pattisonverse) in Batman: Into the Batverse

Michael Keaton

as Batman (Keatonverse) in Batman: Into the Batverse

Kevin Conroy

as Batman (Arrowverse) in Batman: Into the Batverse

Christian Bale

as Batman (Nolanverse) in Batman: Into the Batverse

Ben Affleck

as Batman (DCEU) in Batman: Into the Batverse