Earlier in the season, Billy (Joe Locke), known then only as a "mysterious teen," had pleaded with Agatha to accompany him on that journey. In Episode 5, his true identity is revealed as Wanda's son.
The first big TV release of 2024 on Disney+ has been Agatha All Along, where WandaVision creator Jac Schaeffer gets to continue her story, but focus on fan-favorite villain Agatha Harkness.