Rita didn't take Lexx to see Turning Red per se, but rather a parody of it.
Since the Louds and other characters watch parodies of real movies and shows, such as Speedy the Porcupine and Humdrum Program, perhaps the "magic panda movie" Lexx watched was called something like Seeing Red or Becoming Red.http://tvtropes.org/pmwiki/pmwiki.php/WMG/PeekingThroughTheFourthWall
FollowingWMG / Peeking Through the Fourth Wall
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