Meet Stella Stocker, Liam Neeson’s 'The Mongoose' costar
The actress playing Helene alongside Liam Neeson in The Mongoose has a film and TV résumé that might surprise you.
Stella Stocker steps into The Mongoose as Helene — her latest team‑up with Liam Neeson after sharing the screen with him in Memory and Marlowe. If her face looks familiar beyond the action credits, you may have clocked her in Gotham: she played Martha Wayne in Matt Reeves ’ The Batman, a quick but pivotal turn tied to Bruce Wayne’s family history.
Stocker is a London‑based actress and voice artist who grew up in Germany, France and the Congo. She’s bilingual in English and German and also speaks conversational French. She trained at the University of Hull (BA in Drama ) and at New York’s Lee Strasberg Theatre Institute.
- Special skills: ballet, jazz, modern and tap dance; horse riding; krav maga; judo; stage fighting; climbing; skiing
Where you’ve seen her
- The Batman — Martha Wayne
- Memory — Maya
- Marlowe — Hilda
- The Good Liar — Frau Schröder
- Fury
- Mission: Impossible – Rogue Nation
- Arthur & Merlin: Knights of Camelot
- Blithe Spirit
On TV, Stocker has appeared in Archie and The Chelsea Detective, alongside stage work in London, Berlin and Hull. She’s also built a steady resume in commercials and voiceover.
What is The Mongoose?
Neeson stars as Ryan “Fang” Flanagan, a highly decorated war hero who’s falsely accused of a crime. With police in pursuit, Fang rips into a cross‑country car chase that turns into must‑watch live TV, while members of his former Special Forces unit quietly help him stay a step ahead — and a curious public starts rooting for him.
- Liam Neeson — Ryan “Fang” Flanagan
- Marisa Tomei — Tara
- Ving Rhames — Tanker
- Michael Chiklis — Major Walter Pope
- Stella Stocker — Helene
The movie is directed by Mark Vanselow from a screenplay by Thompson Evans. Filming took place across Melbourne and regional Victoria, with those locations doubling for parts of the United States. It ’s an original action thriller and reunites Neeson with Code Entertainment, the company behind his Australia- shot projects Blacklight and Ice Road 2: Road to the Sky.
The Mongoose opens in U.S. theaters on October 30, 2026.