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Supergirl: Season1 | Episode18
Worlds Finest
Kara gains a new ally when the lightning-fast superhero The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home.
S1 - E1Pilot Oct. 26, 2015
S1 - E2Stronger Together Nov. 02, 2015
S1 - E3Fight or Flight Nov. 09, 2015
S1 - E4Livewire Nov. 16, 2015
S1 - E5How Does She Do It? Nov. 23, 2015
S1 - E6Red Faced Nov. 30, 2015
S1 - E7Human for a Day Dec. 07, 2015
S1 - E8Hostile Takeover Dec. 14, 2015
S1 - E9Blood Bonds Jan. 04, 2016
S1 - E10Childish Things Jan. 18, 2016
S1 - E11Strange Visitor from Another Planet Jan. 25, 2016
S1 - E12Bizarro Feb. 01, 2016
S1 - E13For The Girl Who Has Everything Feb. 08, 2016
S1 - E14Truth, Justice and the American Way Feb. 22, 2016
S1 - E15Solitude Feb. 29, 2016
S1 - E16Falling Mar. 14, 2016
S1 - E17Manhunter Mar. 21, 2016
S1 - E18Worlds Finest Mar. 28, 2016
S1 - E19Myriad Apr. 11, 2016
S1 - E20Better Angels Apr. 18, 2016