Lena Luthor has quickly positioned herself as the main antagonist of Supergirl Season 5. 1 / 8
Lena learned from her brother Lex that Kara was Supergirl in the Season 4 finale. 2 / 8
Feeling betrayed by the deception, Lena quickly developed a revenge scheme against her best friend. 3 / 8
Lena sold CatCo to her estranged friend Andrea, complicating Kara's day job considerably. 4 / 8
Lena's revenge escalated with the arrival of J'onn J'onnz's long-lost brother Malefic. 5 / 8
Lena's secret experiments on Malefic led her to develop powerful mind control technology. 6 / 8
The suddenness of Lena's heel turn largely robbed her of well-measured character development. 7 / 8
The rushed pacing has quickly turned a fan-favorite character into a sneering villain. 8 / 8