Suggestions by @large_male_gorilla

Jentzen Ramirez

as Percy Jackson in Percy Jackson

John Malkovich

as Procrustes in Percy Jackson

Amy Johnston

as Medusa in Percy Jackson

Jamie Foxx

as Ares in Percy Jackson

Jon Hamm

as Hades in Percy Jackson

Jon Bernthal

as Ares in Percy Jackson

Mel Gibson

as Zeus in Percy Jackson

Jason Momoa

as Poseidon in Percy Jackson

Keanu Reeves

as Poseidon in Percy Jackson

Noel Gugliemi

as Gabe Ugliano in Percy Jackson

David Alexander Sjøholt

as Luke Castellan in Percy Jackson

Rose Byrne

as Sally Jackson in Percy Jackson

Scarlett Johansson

as Sally Jackson in Percy Jackson

Michelle Pfeiffer

as Mrs Dodds in Percy Jackson

Toby Osmond

as Mr. D in Percy Jackson

Liam Neeson

as Chiron in Percy Jackson

Idris Elba

as Witch King of Angmar in The Lord of the Rings

Bill Skarsgård

as Gollum in The Lord of the Rings

Kit Harington

as Aragorn in The Lord of the Rings

Reese Witherspoon

as Invisible Woman in Fantastic Four