Abernathy is a supporting antagonist in the Fantastic Beasts: The Crimes of Grindelwald. He is follower of Gellert Grindelwald.
He is portrayed by Kevin Guthrie
In 1926, he served as a supervisor to both Tina and Queenie Goldstein in the Wand Permit Office and was responsible for overseeing their activities and whereabouts. He was unhappy when he found out that Tina had interrupted a meeting held by the Investigative Team again and admonished her. He asked her whether she was investigating the New Salem Philanthropic Society again, but when Percival Graves showed up, he immediately brightened up and politely said hello.
Later, he questioned Queenie where she was going and what she had in her suitcase, while she was attempting to transport Tina, Newt Scamander and Jacob Kowalski from the MACUSA building unnoticed. Queenie replied that she was ill and that the luggage contained women's things. When asked if he wanted to take a look, Abernathy immediately and uncomfortably replied that he would not, and wished her to get well.
Grindelwald turns into Abernathy Abernathy in the Incarceration Carriage A few months later, early in 1927, Abernathy assisted with the escape of Gellert Grindelwald. He helped Grindelwald escape by temporarily switching appearances with the Dark Wizard using Human Transfiguration, and boarding the Incarceration Carriage together with a team of Aurors and Rudolph Spielman. Grindelwald (still bearing Abernathy's appearance) then apparated onto the carriage, killed the Aurors, sent Spielman flying down from the carriage (although he survived thanks to a Slowing Charm), and conjured Abernathy (now restored to his true appearance) a new tongue, while Abernathy gave Grindelwald the salvaged blood pact vial. The two rogue wizards then flew away to Europe, probably to Nurmengard.
Abernathy rally Abernathy in the circle of flames Three months later, Abernathy travelled with Grindelwald and other acolytes to Paris, intending to find Credence Barebone and to spread word of their cause. Abernathy took part in the murdering of a Non-Magical family in Paris with his fellow acolytes, which allowed them to take over the now unoccupied home as a safe haven and base for them. In this house, he keenly listened to how Grindelwald expressed the utmost need to find Credence Barebone, as Credence was the only key which would allow him to kill his former friend Albus Dumbledore, the biggest threat to their cause. Using Human Transfiguration, he took on the appearance of an elderly witch to take a Lestrange family box from Records Room in the French Ministry of Magic, with the assistance of fellow devoted acolyte Vinda Rosier. He later left the box in the Lestrange tomb for Credence to find. Abernathy attended the subsequent rally of Grindelwald's at the Lestrange Mausoleum as one of his acolytes. When Grindelwald conjured a circle of protective fire around himself to test the loyalty of his followers, he stepped into the black flames unharmed and also disapparated away along with his fellow acoyltes (with the sole exception of Krall, who was incinerated in the flames for his disloyalty), showing his intense and unwavering loyalty to Grindelwald and his cause.
- It is currently unconfirmed whether Abernathy joined Gellert Grindelwald before or after the latter's arrest by MACUSA, or what role he played, if any, in Grindelwald's infiltration under the guise of Percival Graves