User blog comment:Jacknapier10/Which characters cannot appear in the Marvel Cinematic Universe?/@comment-25684581-20150729083854/@comment-16461120-20150910090004

During an interview promoting the European premiere of The Avengers, MARVEL Studios President Kevin Feige stated that rights to the Skrulls are owned by both FOX and MARVEL, and either studio could use them in their films. Although he did not say so, it would not be unreasonable to believe that the Skrulls centuries-old enemies the Kree, who also factored heavily in many Fantastic Four and Avengers storylines, were under the same shared agreement. Furthermore, Feige did not clarify the status of one particular Skrull character, the so-called Super Skrull, who has all the powers of the Fantastic Four in addition to his native shape changing ability, though it is generally believed that those rights lie solely with Twentieth Century FOX.

http://www.youtube.com/watch?v=O2nEz-AXmig