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On Supergirl Season 5 Episode 19, Supergirl realizes that in order to stop Lex and Leviathan she must work with the one person she never thought she’d trust again – Lena. Nia keeps dreaming about Brainy, but struggles with what the dreams are trying to tell her. Meanwhile, Brainy realizes there is only one way to stop Lex.
On Supergirl Season 5 Episode 18, Supergirl and the team go head to head against Rama Khan and Leviathan. Meanwhile, Lena and Lex must join forces when Project Non Nocere fails, leaving the two siblings in serious danger.
On Supergirl Season 5 Episode 17, Lex proceeds to lay an intricate plan to bring Lena closer to him, defeat Leviathan’s latest attack, and pit Supergirl and team against Leviathan. It is also revealed how Lex came into power after Crisis.
On Supergirl Season 5 Episode 16, Alex uses a pair of Obsidian contact lenses to visit a virtual National City where she takes on a whole new persona.
On Supergirl Season 5 Episode 15, Nia's roommate gets attacked by someone who is after Dreamer, while Dreamer puts herself in danger to confront the man.
On Supergirl Season 5 Episode 14, Lex tasks Supergirl with protecting Andrea from an anti-tech extremist, but his plans are far more nefarious than they seem.
On Supergirl Season 5 Episode 13, Mxyzptlk returns with a proposition for Kara -- what if she could go back in time and tell Lena her secret before Lex did, would things turn out different? Looking back over key moments throughout the series, Kara must decide if she wants to change history to become friends with Lena again.
On Supergirl Season 5 Episode 12, Kara helps Winn face his greatest fear as Alex sets out to find evidence against Lex, and Brainy must make a decision.
On Supergirl Season 5 Episode 11, as Supergirl attempts to thwart a possible copycat of the Toyman, while Winn Schott returns from the future.
On Supergirl Season 5 Episode 10, the subsequent complications that occurred after the Crisis end up leaving Supergirl to face a chaotic threat.