Chris Hemsworth: Thor Natalie Portman: Jane Foster, The Mighty Tho Christian Bale: Gorr Tessa Thompson: King Valkyrie Taika Waititi: Korg, Old Kronan God Russell Crowe: Zeus Jaimie Alexander: Sif Idris Elba: Heimdall Chris Pratt: Peter Quill, Star-Lord Dave Bautista: Drax Karen Gillan: Nebula Pom Klementieff: Mantis Sean Gunn: Kraglin, On-Set Rocket Vin Diesel: Groot Bradley Cooper: Rocket Carly Rees: Miek Kat Dennings: Darcy Brett Goldstein: Hercules Stellan Skarsgård: Selvig Luke Hemsworth: Actor Thor Matt Damon: Actor Loki Sam Neill: Actor Odin Melissa McCarthy: Actor Hela