Special operation 6 is now live. These 25 Tasks need to be completed in order to unlock and recruit Havok.
Beast, Deadpool, and Tigra are needed to complete task 25. If you don't have enough Command Points, you may want to save 25 Gold so you can skip the task. Defeating monsters and bosses in the normal chapter won't count toward task completion. See Spec Ops 6 Task List
Read More: http://www.avengersallianceguide.com/2013/01/marvel-avengers-alliance-special-operation-spec-ops-6-task-list.html