As the son and daughter of a mysterious and powerful serial killer, Helstrom follows Daimon and Ana Helstrom, and their complicated dynamic, as they track down the worst of humanity — each with their own attitude and skills.
- Tom Austen as Daimon Helstrom / Basar
- Sydney Lemmon as Ana Helstrom
- Elizabeth Marvel as Victoria Helstrom / Kthara
- Robert Wisdom as Caretaker
- Ariana Guerra as Gabriella Rosetti
- June Carryl as Louise Hastings
- Alain Uy as Chris Yen
- Daniel Cudmore as Keith Spivey / Basar
- Shayn Walker as Ellis
- Deborah Van Valkenburgh as Esther Smith
- Zachary S. Williams as Bryce / Magoth
- David Meunier as Finn Miller / Magoth
- Trevor Roberts as Father Joshua Crow / Raum
- Hamza Fouad as Derrick Jackson
In May 2019, it was reported that Marvel Television was producing a TV series featuring Daimon and Ana Helstrom on Hulu. Paul Zbyszewski would serve as showrunner and executive producer, while Jeph Loeb would also be executive producer.
In September 2019, it was reported that the series would be filming under the working title Omens, and that production would start on October 7, 2019. Filming was expected to last until February 28, 2020.
On October 8, 2019, the series' main cast was announced.
On March 15, 2020, it was reported that the production of the first season of Helstrom had wrapped.
On June 22, 2020, it was reported that the series would be released around Halloween 2020.
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