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Skrull/X Men variant - Wolverine - Cyclops
Skrull/Fantastic 4 variant - Human Torch, The Thing and Mr Fantastic
Skrull/Future Foundation variant
Skrull/Avenger variant - Thor - Loki
Skrull/Avenger variant roughs
Spiderwoman - Skrull Queen - Shape Shift
Super Skrull - Early exploration.
Initially the Skrull direction was taking it's influence from Comic versions.
Super Skrull - Early thumbnail exploration
Skrull Commander - Early Direction
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Marvel's The Avengers picks up when an unexpected enemy emerges that threatens global safety and security. And Nick Fury, director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. With director Joss Whedon at it's helm, and an ensemble cast including Chris Evans (Steve Rogers), Robert Downey Jr. (Tony Stark), Chris Hemsworth (Thor Odinson), Jeremy Renner (Clint Barton), Mark Ruffalo (Bruce Banner), Scarlett Johansson (Natasha Romanoff), Clark Gregg (Agt. Phil Coulson), Cobie Smulders (Maria Hill), Samuel L. Jackson (Nick Fury), with Tom Hiddleston (Loki), and Stellan Skarsgard (Professor Erik Selvig), the film releases worldwide May 4, 2012!