Suggestions by @iamanerd

Sam the Eagle

as Captain America in Muppet MCU

Fernando González 'Gonzo'

as Iron Man in Muppet MCU

"Weird Al" Yankovic

as Composer in The Muppets in Star Wars

Pepe

as Indiana Jones in The Muppets in Star Wars

Ellen DeGeneres

as Alice Nelson in The Brady Bunch

Jürgen Prochnow

as Red Skull in Old Man Hawkeye

Mel Gibson

as Multiple Man in Old Man Hawkeye

Hugh Jackman

as Old Man Logan in Old Man Hawkeye

Kurt Russell

as Clint Barton in Old Man Hawkeye

Eddie Murphy

as Hong Kong Phooey in DC meets Hanna Barbera

Cress Williams

as Black Lightning in DC meets Hanna Barbera

William Shatner

as Space Ghost in DC meets Hanna Barbera

Tom Cruise

as Green Lantern in DC meets Hanna Barbera

Dan Aykroyd

as Yogi Bear in DC meets Hanna Barbera

Jim Parsons

as Top Cat in DC meets Hanna Barbera

Will Arnett

as Slade in DC meets Hanna Barbera

Arnold Stang

as Top Cat in DC meets Hanna Barbera

Mark Wahlberg

as Batman in DC meets Hanna Barbera

Kate Micucci

as Velma Dinkley in Scooby Apocalypse

Karen Gillan

as Daphne Blake in Scooby Apocalypse