I hope this is the right forum for this. The idea is to take the cast of a show and only use actors from that show to cast a movie. You can go back in time to old shows as well.
First up
 LOST / X-MEN
I think Josh Holloway would make a good Wolverine because of his demeanor and attitude. His height doesn't matter. I included characters who never made it to the movies but I might like to see.

Terry O'Quinn - Professor Charles Xavier

Alan Dale - Eric Lensherr / Magneto

Matthew Fox - Scott Summers / Cyclops

Rebecca Mader - Jean Grey

Ian Somerhalder - Angel

William Mapother - Beast

Josh Holloway - Wolverine

Tania Raymonde - Kitty Pryde

Dominic Monaghan - Banshee

Henry Ian Cusick - Gambit

Evangeline Lilly - Rogue

Emilie de Ravin - Polaris

Nestor Carbonell - Mr Sinister

Jorge Garcia - The Blob

Adewale Akinnuoye-Agbaje - Bishop

John Terry - Senator Robert Kelley

Sonya Walger - Moira Mctaggert

Andrew Divoff - Omega Red

Doug Hutchison - Mastermind

Daniel Dae Kim - Sunfire

Yunjin Kim - Psylocke

Clancy Brown - Sabertooth

Maggie Grace - Dazzler

Brett Cullen - Henry Gyrich

Alice Evans - Emma Frost

Sarah Wagner - Mystique