Dexter used a gender-swapping machine to change Dee Dee into a boy thinking that she would be less annoying as a boy. When he did, Doo Dee was much worse than Dee Dee. He always beat him up and abused him. Dad always loved Doo Dee more than Dexter. In the end of the episode, Dexter lured Doo Dee back into the machine with a foot ball and changed him back into Dee Dee again. After that, Dexter kept loving Dee Dee because she was better than Doo Dee and that he was lucky and glad to have her which left her confused as to his unnatural behavior.