As soon as the needle drops on the record player in the new Supergirl: Woman of Tomorrow teaser trailer and an iconic rock track begins to play, a fresh, exciting, and most importantly, unruly attitude snaps into place.

Mr. Mxyzptlk popped in once again on “Supergirl” this week and finally redeemed himself to Kara and the Super Friends by helping them weaken Nyxly. Unfortunately, he had to sacrifice himself to do it — and that sacrifice is looking pretty permanent.