Fetish Fuel: The Dark Doctor's possession of Autumn in "Deal with the Dark Doctor" could trigger plenty of mind control fetishes.
Fetish Retardant: Those ballerina costumes? The ones that are heavily sexualized? We get to see a preteen girl in one, whose dance is already way too mature for someone her age. Thanks, but no thanks.
Growing the Beard: Either the second season, or third, or both, stepped up the game. The third season made good on it's generically vague hints of a Myth Arc and has more complex character building in its episodes, rather than the former mindless "action".