Supergirl and team must stop Nyxly from vanquishing a familiar face from Supergirl's past - Mr. Mxyzptlk. Mxy returns and explains Nyxly's dark history to the super team in the best way he knows how - in song form. Meanwhile, Lena visits her mother's birthplace in Newfoundland, eager to dig into her past but is shocked by the small town's icy reception towards her.
Quest roles:
Thomas Lennon(Mxyzptlk), Matt Baram(Mitch), Emmanuelle Vaugier(Margaret 'Peggy' Bishop), Colleen Wheeler(Florence Abbott), Bronwen Smith(Dee-Dee), Larry Hoe(David)