Mr. & Mrs. Mxyzptlk is an episode of the superhero TV series that originally aired on the CBS network.
"Mr. & Mrs. Mxyzptlk" is the thirteenth episode of the second season from The CW television series "Supergirl", which aired on February 20, 2017. 
Supergirl is an American superhero action-adventure television series developed by Ali Adler, Greg Berlanti and Andrew Kreisberg (the latter two having previously created "Arrow" and "The Flash") that originally aired on CBS and premiered on October 26, 2015. 
