Suggestions by @morganwhite

Sara Tomko

as Danielle Moonstar in X-Men (MCU)

Zac Efron

as Sunspot in X-Men (MCU)

Javier Bardem

as Mr Sinister in X-Men (MCU)

Johnny Galecki

as Wolverine in X-Men (MCU)

Johnny Galecki

as Wolverine in MCU X-Men

Javier Bardem

as Mr Sinister in MCU X-Men

Simon Helberg

as King Urgit of Cthol Murgos in The Belgariad

Camila Mendes

as Vella in The Belgariad

Jake Gyllenhaal

as Seamus Costello in Reamde

Jameela Jamil

as Memmie in Seveneves

George Takei

as "Doc" Hu Noah in Seveneves

Henry Cavill

as Markus Leuker in Seveneves

Jeffrey Wright

as "Doc" Dubois Jerome Xavier Harris in Seveneves

Tracee Ellis Ross

as Memmie in Seveneves

Vera Farmiga

as Ulrika Ek in Seveneves

Paul Nutarariaq

as Einstein in Seveneves

Zachary Quinto

as Cal Blankenship in Seveneves

William Fichtner

as Pete Starling in Seveneves

Joe Rogan

as Tavistock Prowse in Seveneves

Matt Damon

as Tyuratam "Ty" Lake in Seveneves