Just out of curiosity, does anyone find the stark difference in quality and tone between Cartoon Network shows and Nickelodeon shows bizarre? I don't know if it's real, so I'm asking.

I agree. Although Margaret has been much more developed and still seems pretty good for Mordecai, C.J. seems better (plus she's voiced by Linda Cardellini, apparently? Hi, Lindsay! And the hottest depiction of Velma!) for Mordecai.