Star Wars Rebels: The Siege of Lothal is the premiere television film of the second season of Star Wars Rebels. It is the second television film of the series overall. It premiered on June 20, 2015. It was written by Henry Gilroy and directed by Bosco Ng & Brad Rau.
Official description
The Inquisitor is dead. The Ghost crew has connected with other rebel cells. And a new ally named Ahsoka Tano has emerged. Despite these successes and developments, the fight against the Empire takes a deadly turn, as the evil Sith Lord Darth Vader comes to Lothal.