Suggestions by @davidsampson

Gary Cole

as Scarface in The Nine Unconfirmed Sightings of The Batman

Frank Birney

as Arnold Wesker/The Ventriloquist in The Nine Unconfirmed Sightings of The Batman

Adrian Pasdar

as Deadshot/Floyd Lawton in The Nine Unconfirmed Sightings of The Batman

Thomas F. Wilson

as Roman Sionis/Black Mask in The Nine Unconfirmed Sightings of The Batman

Cam Clarke

as Victor Zsasz in The Nine Unconfirmed Sightings of The Batman

Wilson Bethel

as Deadshot/Floyd Lawton in The Nine Unconfirmed Sightings of The Batman

Jason Spisak

as Oswald Cobblepot/Penguin in The Nine Unconfirmed Sightings of The Batman

Matthew Lillard

as Victor Zsasz in The Nine Unconfirmed Sightings of The Batman

Thomas F. Wilson

as Deadshot/Floyd Lawton in The Nine Unconfirmed Sightings of The Batman

Khary Payton

as Killer Croc/Waylon Jones in The Nine Unconfirmed Sightings of The Batman

Dorian Harewood

as Lucius Fox in The Nine Unconfirmed Sightings of The Batman

Keith Szarabajka

as Detective Harvey Bullock in The Nine Unconfirmed Sightings of The Batman

Beth Behrs

as Dr. Harleen Quinzel in The Nine Unconfirmed Sightings of The Batman

Jane Levy

as Pamela Isely/Poison Ivy in The Nine Unconfirmed Sightings of The Batman

Giancarlo Esposito

as Mr. Freeze/Victor Fries in The Nine Unconfirmed Sightings of The Batman

Katherine Langford

as Helena Bertinelli in The Nine Unconfirmed Sightings of The Batman

Enn Reitel

as Alfred Pennyworth in The Nine Unconfirmed Sightings of The Batman

JB Blanc

as Alfred Pennyworth in The Nine Unconfirmed Sightings of The Batman

Rob Paulsen

as Commissioner James Gordon in The Nine Unconfirmed Sightings of The Batman

Quinton Flynn

as Mysterio/Quentin Beck in Spider-Man: One More Spin