Supergirl: 2x13
Mr. & Mrs. Mxyzptlk
When Mr. Mxyzptlk, a magical imp, shows up on Earth and declares his love for Kara, she tries to let him down easy, thinking him harmless. However, he decides it’s a challenge and starts to wreak havoc on National City. Mon-El has seen beings like Mr. Mxyzptlk on Daxam and knows how dangerous they can be. He and Kara argue over how to get rid of Mr. Mxyzptlk, further straining their relationship. Meanwhile, Alex and Maggie celebrate their first Valentine’s Day together.
2 - 1The Adventures of Supergirl Oct. 10, 2016
2 - 2The Last Children of Krypton Oct. 17, 2016
2 - 3Welcome to Earth Oct. 24, 2016
2 - 4Survivors Oct. 31, 2016
2 - 5Crossfire Nov. 07, 2016
2 - 6Changing Nov. 14, 2016
2 - 7The Darkest Place Nov. 21, 2016
2 - 8Medusa (I) Nov. 28, 2016
2 - 9Supergirl Lives Jan. 23, 2017
2 - 10We Can Be Heroes Jan. 30, 2017
2 - 11The Martian Chronicles Feb. 06, 2017
2 - 12Luthors Feb. 13, 2017
2 - 13Mr. & Mrs. Mxyzptlk Feb. 20, 2017
2 - 14Homecoming Feb. 27, 2017
2 - 15Exodus Mar. 06, 2017
2 - 16Star-Crossed (I) Mar. 20, 2017
2 - 17Distant Sun Mar. 27, 2017
2 - 18Ace Reporter Apr. 24, 2017
2 - 19Alex May. 01, 2017
2 - 20City of Lost Children May. 08, 2017
2 - 21Resist May. 15, 2017
2 - 22Nevertheless, She Persisted May. 22, 2017