Suggestions by @milesyeargain

Tony Todd

as Martian Manhunter in Martian Manhunter: The Jade Warrior (1995)

Martin Scorsese

as Director in The Flash: Fastest Man Alive (1995)

Ernie Hudson

as Joe West in The Flash: Fastest Man Alive (1995)

Joy Bryant

as Iris West-Allen in The Flash: Fastest Man Alive (1995)

Sam Rockwell

as Mirror Master in The Flash: Fastest Man Alive (1995)

Nicolas Cage

as Captain Cold in The Flash: Fastest Man Alive (1995)

FAKE

as The Flash in The Flash: Fastest Man Alive (1995)

Martin Scorsese

as Director in Superman: Truth and Justice (1995)

Sam Elliott

as Jon Kent in Superman: Truth and Justice (1995)

Sally Field

as Martha Kent in Superman: Truth and Justice (1995)

Paul Walker

as Jimmy Olsen in Superman: Truth and Justice (1995)

Paul Sorvino

as Perry White in Superman: Truth and Justice (1995)

Sandra Bullock

as Lois Lane in Superman: Truth and Justice (1995)

Billy Zane

as Metallo in Superman: Truth and Justice (1995)

Clancy Brown (Lex Luthor)

as Lex Luthor in Superman: Truth and Justice (1995)

Brendan Fraser (Superman)

as Superman in Superman: Truth and Justice (1995)

Martin Scorsese

as Director in Green Lantern: Hal Jordan (1994)

James Earl Jones

as The Main Guardian in Green Lantern: Hal Jordan (1994)

Ving Rhames

as Kilowog in Green Lantern: Hal Jordan (1994)

Demi Moore

as Carol Ferris in Green Lantern: Hal Jordan (1994)