Black Mercy
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Real Identity: Not Applicable
Appearances (Webisodes): For The Girl Who Has Everything Part 1 and For The Girl Who Has Everything Part 2
Powers/Skills: Dream Manipulation
Voiced By: John DiMaggio
The Black Mercy is an parasitic alien plant that feeds on its victims while trapping them in a dream-like state catered to their desires. Several Green Kryptomites attempted to steal a dormant Black Mercy from Supergirl's rocket ship but Harley Quinn crushed them to pieces with her chattering teeth. Poison Ivy mistook it for a Kryptonian species and grew it in an effort to cheer Supergirl up after a bad week. She rested the pot near her bedside as she slept off the effects of the Kryptomites. Supergirl found herself getting an A for her diorama after Grodd initially gave her a C. She then learned Super Hero High School was renamed after her when it was discovered she became immune to Kryptonite. Supergirl began to suspect things were not right and battled Grodd, who was a manifestation of the Black Mercy. Meanwhile, Harley, Batgirl, Wonder Woman, and Poison Ivy wrestled with the Black Mercy, still attached to Supergirl's chest. On Ivy's signal, Katana used her blade to sever the Mercy. In the process, the girls were covered in the Mercy's purple juices. The remains tried to lunge at Supergirl but Chompy rose up from the floor and ate it.