Suggestions by @jmontgomery

Keanu Reeves

as Silver Surfer in Silver Surfer

Adam McKay

as Writer in Silver Surfer

Adam McKay

as Director in Silver Surfer

Jeff Garlin

as Detective Harvey Bullock in Batman

Nick Offerman

as Detective Harvey Bullock in Batman

John Barrowman

as Galactus in Nova

Tom Vaughan-Lawlor

as Ebony Maw in Nova

Andy Serkis

as Annihulus in Nova

Keanu Reeves

as Norrin Radd in Nova

John Krasinski

as Reed Richards in The Ultimates

Keanu Reeves

as Silver Surfer in The Ultimates

Leonardo DiCaprio

as The Fulcrum in The Ultimates

Amanda Seyfried

as Queen of Nevers in The Ultimates

Mark Strong

as One Above All (Celestial) in The Ultimates

Bryan Cranston

as One Above All in The Ultimates

David Hyde Pierce

as Eternity in The Ultimates

Bruce Willis

as Anti-Man in The Ultimates

David Tennant

as LOGOS in The Ultimates

Orlando Jones

as Lord Chaos in The Ultimates

Dennis Quaid

as Master Order in The Ultimates