John Kiley tricks Superman into revealing he's Clark Kent. After trapping Clark Kent with Kryptonite, Supergirl and the Superman Emergency Squad spring into action.; Supergirl helps out the Legionnaires, then defeats the Chameleon Men imposters.; Supergirl devises a series of contests between Streaky and Krypto.; Mr. Mxyzptlk decides to pester Supergirl while Superman is away from Earth, so he first changes many people into Bizarros and then restores Supergirl's Kryptonian parents to life, before deciding that Supergirl should marry him.; Superman punishes Supergirl for revealing her existence to Krypto. But Supergirl discovers a secret about Superman all by herself.