Costume

 Though changing her into a half human half animal would be nice.   The idea of having her in a costume acting as an animal when she is in it and a woman when she is not sounds even better.  That way you could live out both fantasies at the same time.  Plus you could aways send away for one of the other two spies to come as a permament pet.  After all Clover did look really hot as a cat girl in that episode.

 Now there is a question what should Alex's costume be?  Catgirl, doggirl, ponygirl, bunnygirl.   Those are the oveous ones everyone chooses.  In fact they come with preprogramed settings and are the first four on the list so you know they are the most popular.  Though Alex has always been your favorate of the three spies she should be as rare and special too.   So you look though the whole list.  Animal, insect, mythical creatures, ect.

 After you look though the whole list you know what you want.  The list alows you to futher modify her body and both suit and skin color if you want.  'Wow so much to choose but I know what I want.'  You think to yourself and hit the buttons.