: Maxwell Lord finally reveals his secret experiment: a clone by conversion designed to destroy Supergirl. It took seven failed attempts—resulting in the deaths of the previous subjects—before this "Jane Doe" successfully survived the procedure.
The episode ends on a downer note; Bizarro is defeated and returned to an artificial coma at the DEO, with Kara feeling deep sympathy for the "innocent" girl Lord used as a weapon. The final scene sets up the next episode as Kara returns home to find a strange, tentacled "Black Mercy" creature on her ceiling. Supergirl (2015) S1E12 "Bizarro" Recap - TV Tropes [S1E12] Bizarro
: Outraged by Lord’s unethical experiments and threats to her family, Alex Danvers takes the law into her own hands and arrests Maxwell Lord at the DEO without legal grounds, leading to a "What the Hell, Hero?" moment from J'onn. Conclusion and Cliffhanger : Maxwell Lord finally reveals his secret experiment: