Suggestions by @luisperezcozar

Tara Strong

as Saturn Girl in Scooby-Doo! & Justice League Unlimited

Rachel York

as Circe in Scooby-Doo! & Justice League Unlimited

Dee Bradley Baker

as Blockbuster in Scooby-Doo! & Justice League Unlimited

George Newbern

as Bizarro in Scooby-Doo! & Justice League Unlimited

Ted Levine

as Sinestro in Scooby-Doo! & Justice League Unlimited

Christopher Swindle

as Shade in Scooby-Doo! & Justice League Unlimited

Olivia D'Abo

as Star Sapphire in Scooby-Doo! & Justice League Unlimited

Ron Perlman

as Clayface in Scooby-Doo! & Justice League Unlimited

Robin Atkin Downes

as Gentleman Ghost in Scooby-Doo! & Justice League Unlimited

Julie Bowen

as Aresia in Scooby-Doo! & Justice League Unlimited

Sheryl Lee Ralph

as Cheetah in Scooby-Doo! & Justice League Unlimited

CCH Pounder

as Amanda Waller in Scooby-Doo! & Justice League Unlimited

Finola Hughes

as Lara Lor-Van in Scooby-Doo! & Justice League Unlimited

Christopher McDonald

as Jor-El in Scooby-Doo! & Justice League Unlimited

Wil Wheaton

as Blue Beetle/Ted Kord in Scooby-Doo! & Justice League Unlimited

Jeremy Piven

as Elongated Man in Scooby-Doo! & Justice League Unlimited

Matt Lanter

as Blue Beetle/Ted Kord in Scooby-Doo! & Justice League Unlimited

Wil Wheaton

as Blue Beetle/Ted Kord in Scooby-Doo! & Justice League Unlimited

Omid Abtahi

as Hawkman (Earth-D) in Scooby-Doo! & Justice League Unlimited

Cyrus Rodas

as Aquaman (Earth-D) in Scooby-Doo! & Justice League Unlimited