Teen Titans S01 E02 Sisters

"When there's trouble, you know who to call."

When a mysterious alien probe comes to haul Starfire away, sweet-natured Star has no idea why it came. And when Starfire's sister Blackfire stops by to visit, Starfire just wishes she would leave. Blackfire's wild, cool, and hip-- everything Starfire's not. The other Titans seem to like Blackfire so much, Starfire thinks they won't need her around anymore.