Ezra, Kanan and Ahsoka's exploration of the abandoned Jedi temple is cut short by an unexpected guest in a preview of the Season 2 finale of "Star Wars Rebels."

In the special one-hour event, "Twilight of the Apprentice," the three Jedi battle the Inquisitors with the help of a new ally, but are outmatched when Darth Vader arrives.

The season finale airs Wednesday at 9 p.m. ET/PT on Disney XD.