In the DC Comics, Magpie is an alias utilised by Margaret Pye, the former curator of the Gotham Museum of Antiquities. Her obsession with owning shiny objects eventually drove her insane and she started to pursue a life of crime. The character was created by John Byrne and first appeared in The Man of Steel #3 in 1986. Magpie underwent a major revamp for the character's appearance on the 2013 animated series Beware the Batman. Renamed Margaret Sorrow, this version of the character can grow poisonous claws for nails and suffers from a dissociative identity disorder after an experiment that would purge her kleptomaniac tendencies in return for a reduced sentence at Blackgate Penitentiary.
The villain Bird, Bane's right-hand man in the comics, makes his live-action debut. Although his real name is unknown in the comics, "Angel Vallelunga" is borrowed from Batman: Arkham Origins (2013).
This was originally titled "The Air is Getting Slippery."
The production code was T40.10056.