The guest announcements keep on coming, as organizers for MCM London Comic Con, which takes place between the 22nd and 24th May 2026 at the ExCeL Centre in London, have today announced that actors Richard Horvitz, Vivian Nixon Williams, and Erika Henningsen, will be attending all three days of the event.
Richard Horvitz, Vivian Nixon Williams, and Erika Henningsen will be attending MCM London Comic Con across all three days for autographs and photo opportunities, with tickets for these available to book online through the official website. All three guests have a history of voice acting work, with Richard Horvitz providing the voice for Alpha Five in Mighty Morphin Power Rangers as well as other notable characters.
Richard Steven Horvitz is an American voice actor and voice director. He voices Moxxie and his father in Helluva Boss and also serves as the series’ voice director. He is also the voice director for the Hazbin Hotel series[1] and provides voice work in the episode “Curtain Call”. He does numerous voice roles for minor characters such as Eddie, the Carnival Imp in “Loo Loo Land”, and the demon child in St. An’s Hospital in “Western Energy”.
Vivian Nixon Williams is an American dancer and actress. She is known for her recurring role as Hannah Brody on Grey’s Anatomy and for voicing Millie in Helluva Boss. Vivian was a dancer on Smash and was a guest star on Glee as Andrea Cohen.
Erika Henningsen is a Broadway actress best known for originating and playing the role of Cady Heron in the musical adaptation of Mean Girls and providing the voice of Charlie Morningstar in Hazbin Hotel.
All three guests will be attending MCM London Comic Con May 2026 for all three days, an event which will take place at the ExCeL Centre in London between 22nd and 24th May 2026 with Day and Weekend tickets available. Further details and availability can be found through the official website.
