Avengers Academy (2010) #18
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Characters
Despondent and hopeless after it was discovered that she was not, in fact, Spider-Woman, Mary MacPherran encountered Doctor Doom, who offered her a chance to become superpowered in exchange for joining his army, to which Mary readily agreed, and Doom transformed her into Titania.
After brilliant scientist Henry Pym discovered a process in which he could manipulate a newly discovered group of subatomic particles through magnetic fields, he tested the serums on himself and accidentally shrunk himself to the size of an ant.