<p class="ingestion featured-caption">Joe Locke as Teen, Aubrey Plaza as Rio Vidal, Kathryn Hahn as Agatha Harkness, and Sasheer Zamata as Jennifer Kale in "Agatha All Along."Chuck Zlotnick/Marvel Studios</p><ul class="summary-list"><li>The "WandaVision" spinoff "Agatha All Along" premieres on Disney+ with two episodes on Wednesday.</li><li>The Marvel series stars <a target="_blank" class href="https://www.businessinsider.com/kathryn-hahn-wandavision-costume-cooling-suit-2021-4">Kathryn Hahn</a> as a witch named Agatha Harkness.</li></ul><p>Marvel's "WandaVision" spinoff series "<a target="_blank" class href="https://www.businessinsider.com/disney-plus-marvel-shows-2019-4">Agatha All Along</a>," centered on Kathryn Hahn's witch, <a target="_blank" class href="https://www.businessinsider.com/wandavision-agnes-agatha-harkness-hints-2021-2">Agatha Harkness</a>, has arrived just in time for the spooky season.</p><p>Agatha, first introduced as the <a target="_blank" class href="https://www.businessinsider.com/wandavision-reveals-villain-whats-been-going-on-2021-2">villain</a> in the 2021 miniseries "WandaVision," returns in her own series, which debuts on Disney+ on Wednesday with two episodes. This time, she embarks on a journey on the Witches' Road with a coven of unlikely allies in the hopes of regaining her powers.</p><p>In case you need a refresher on what happened to Agatha in "<a target="_blank" class href="https://www.businessinsider.com/wandavision-finale-unanswered-questions">WandaVision</a>" and other important details from the Marvel Cinematic Universe, Business Insider has you covered with the most pertinent information to keep in mind before diving into the new series.</p>