Sam and Dean take on a case with Castiel, who has decided to become a hunter. However, they discover that the murder is only the latest in a string of cartoon deaths.
Superman must repeatedly deal with Mr. Mxyzptlk a strange and powerful being from the fifth dimension.
Young Clark Kent discovers his true identity; and as an adult presents himself to Metropolis as Superman.
Superman thwarts a plot by Lex Luthor to sell the LEXO-SKEL SUIT 5000 to Kaznian terrorists, via their agent John Corben.