Avengers Academy (2010) #19
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Although she was able to use the cat's-head amulet to change back to her human form, Greer Nelson became so accustomed to and enamored of her feline form that she seldom made the transformation.
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.