When the Ahsoka TV series was announced, Star Wars fans were excited over rumors that Hayden Christensen would return as Darth Vader. He reprised the role in the Obi-Wan Kenobi series, and thankfully, he shows up once more to bring his journey full-circle. This time, he's in the World Between Worlds, meeting Ahsoka as she toes the line between life and death.
Source:https://www.cbr.com/ahsoka-darth-vader-real-version/