Supergirl (2015)

S2E7 The Darkest Places

Title: The Shadowed Depths Plot: As Guardian works tirelessly to vindicate himself from the wrongful murder allegations pinned on him by a rival vigilante, Supergirl embarks on a daring solo quest to save Mon-El, who has fallen into the clutches of Cadmus. In her struggle to liberate him, she unexpectedly encounters Cyborg Superman, leading to a fierce confrontation that will test her resolve.