"The Hollywood Reporter" stated that Zbyszewski would continue post-production work on the series. Marvel announced the series' cast at the start of production in October 2019: Tom Austen and Sydney Lemmon star as Daimon and Ana Helstrom, with Elizabeth Marvel as their mother Victoria, Robert Wisdom as Caretaker, June Carryl as Dr. Louise Hastings, Ariana Guerra as Gabriella Rosetti, and Alain Uy as Chris Yen. In November 2019, Daniel Cudmore and David Meunier were cast in the recurring roles as Nurse Keith Spivey and Finn Miller, respectively. Production on the series began on October 7, 2019, in Vancouver, under the working title "Omens". Filming wrapped on March 14, 2020. Hulu and Marvel announced both "Helstrom" and a Ghost Rider series in May 2019, referring to them as the cornerstone of the "Spirits of Vengeance" and intending on them being interconnected in a similar fashion to Marvel's Netflix television series. Marvel revealed that the two series would exist within the Marvel Cinematic Universe, but would not crossover with the films or other television series of the franchise. In August, Loeb revealed that the fear-based series at Hulu were being collectively referred to as Adventure into Fear. Hulu was no longer moving forward with "Ghost Rider" by the end of September, but other Adventure into Fear series were still planned. Development on any further series was cancelled in December 2019 when Marvel Television was shut down. "Helstrom" is scheduled to debut on Hulu in late 2020 as part of Hulu's "Huluween" programming block, and run for 10 episodes.