The line comes from Star Wars Rebels, the animated series that continued the story after the Clone Wars, in its second season finale, Twilight of the Apprentice. There, Ahsoka confronts Vader on Malachor and refuses to abandon him, despite learning who he has become. His reply marks the point of no return in their relationship and became a widely shared moment among Star Wars fans. It is often paired with the Imperial March in edits, and still circulates as a shorthand for an ominous, unavoidable confrontation.