Black Heron is a spy working for the criminal organization F.O.W.L. In the 1960s, she was sent to London to get the recipe for an ancient potion (the Gummiberry Juice) that F.O.W.L. wanted to utilize for creating superpowered soldiers. Although she managed to get her hands on the recipe, she was stopped by Agent 22 and her partner, freelance agent Scrooge McDuck, and she lost her right arm in the incident.
Role in the series
50 years later, in the events of the episode From the Confidential Casefiles of Agent 22!, Black Heron breaks into McDuck Manor and kidnaps Mrs. Beakley to have her revenge and get the recipe for the potion. After learning about that, Scrooge goes on a mission to rescue her, unwittingly accompanied by Beakley's granddaughter Webby Vanderquack. After finding her and stealing the Gummi Juice, Webby defeats Black Heron, swiping the rest of the potion in the scuffle, who falls into the sea, leaving only her prosthetic arm behind, implying she presumably died from the fall.
At the very end of the Season 2 episode, "Moonvasion!", it is revealed that Black Heron did survive her fall, though she is still missing her arm as she's having a meeting with other F.O.W.L. members about defeating the McDuck Family.
By "Challenge of the Senior Junior Woodchucks!", the mosquito bothering Donald is revealed to be a robotic mosquito linked to F.O.W.L., where Gandra Dee tells the evil agency that the McDuck family found a journal known as "The Missing Mysteries" where she discovers access to find extremely rare relics just as F.O.W.L. continues their plan to take out the McDucks.
In "Double-O-Duck in You Only Crash Twice!", she tasks Steelbeak with using a beam that can raise or lower a target's intelligence to turn Scrooge into a harmless idiot. She is also revealed to have created the show's version of the Rescue Rangers through lab animal testing of the device.
- Black Heron, having lost her right arm, is the first known DuckTales 2017 character to be an amputee and known to be a cyborg (before Della Duck).