Suggestions by @boomstick2000

F. Murray Abraham

as Tomar Re in Green Lantern : First Flight (1989)

Idris Elba

as Bronze Tiger in The Suicide Squad (2006)

Alan Moore

as Writer in Watchmen (1991)

Vangelis

as Composer in Watchmen (1991)

Philip Baker Hall

as President Richard Nixon in Watchmen (1991)

Paul Winfield

as Dr Malcom Long in Watchmen (1991)

Anthony Perkins

as Moloch in Watchmen (1991)

Janet Leigh

as Sally Jupiter in Watchmen (1991)

Roy Scheider

as Hollis Mason in Watchmen (1991)

Robert De Niro

as Comedian in Watchmen (1991)

Tom Cruise

as Ozymandias in Watchmen (1991)

Christopher Reeve

as Doctor Manhattan in Watchmen (1991)

Madeleine Stowe

as Silk Spectre in Watchmen (1991)

Kevin Costner

as Nite Owl in Watchmen (1991)

Brad Dourif

as Rorschach in Watchmen (1991)

Oliver Stone

as Director in Watchmen (1991)

Dean Stockwell

as Henry Allen in The Flash : The Scarlett Speedster (1989)

Jeremy Renner

as Rick Flag in The Suicide Squad (2006)

Ali Larter

as Killer Frost in The Suicide Squad (2006)

Michael Clarke Duncan

as Killer Croc in The Suicide Squad (2006)