Suggestions by @mastercasting

Dylan Minnette

as Kite-man in Flash and Harley Quinn

Steve Agee

as King Shark in Flash and Harley Quinn

Tobey Maguire

as Clayface in Flash and Harley Quinn

Toby Jones

as Doctor Psycho in Flash and Harley Quinn

Colin Salmon

as Red Tornado in Flash and Harley Quinn

Andy Samberg

as Plastic Man in Flash and Harley Quinn

Jason Momoa

as Aquaman in Flash and Harley Quinn

Adam Scott

as Blue Beetle in Flash and Harley Quinn

Charlie Hunnam

as Green Arrow in Flash and Harley Quinn

Zane Austin

as Flash in Flash and Harley Quinn

Mary Elizabeth Winstead

as Huntress in Flash and Harley Quinn

Jurnee Smollett

as Black Canary in Flash and Harley Quinn

Ella Jay Basco

as Cassandra Cain in Flash and Harley Quinn

Jessica Chastain

as Poison Ivy in Flash and Harley Quinn

Margot Robbie

as Harley Quinn in Flash and Harley Quinn

Matt Lucas

as Mr. Freeze in The Batman

Sadie Sink

as Poison Ivy/Dr. Pamela Isley in The Batman

Alicia Vikander

as Spider-Woman in Marvel Cinematic Universe

Griffin Gluck

as Cyclops in Marvel Cinematic Universe

Mena Massoud

as Kurt Wagner in Marvel Ultimate Alliance