"Sisters" is the second episode of the Teen Titans series.
Starfire's older sister Blackfire comes to Earth for a visit, while at the same time Starfire herself is getting attacked by an alien probes sent out to capture her. Starfire is happy to see Blackfire, but Blackfire being everything Starfire isn't, quickly starts to take her place on the team. Feeling they don't need her anymore, Starfire starts to think of leaving Earth for good. Will Starfire say goodbye to the Teen Titans, Will Robin be able to change her mind or Is there more to Blackfire then meets the eye?.
The Teen Titans are enjoying a fair when Starfire is suddenly abducted by an Alien Probe. The team succeed in fighting it off, but are left wondering where it came from. They return to Titans Tower, to discover Starfire's older sister, Blackfire, has stopped by Earth for a visit.
Starfire is initially overjoyed to see her elder sister, however her sisterly feelings change when Blackfire is well-received by the other Titans, and Starfire feels abandoned. Her attempts to restore her team's interest in her prove futile, and only sees the others getting further impressed by Blackfire. While attempting to spark the Titans' interest by having a movie night, Blackfire steals the attention by inviting them to a disco. Starfire is left alone when the other Titans manage to find partners for a dance. Robin tries to talk to her, but Blackfire drags him off. Starfire once again encounter the probes, which manage to overwhelm her. The Titans come to her rescue, where Blackfire destroys all the probes with light purple-colored blackbolts from her eyes. When Robin asks her how she did it, she replies with a hint of a smile that it was just a lucky guess. Cyborg remarks that they need that kind of luck and offers Blackfire a spot on the team. Starfire, who is still recovering from the attack, gasps in shock.
Starfire is sad about this at first, but then comes to the decision that the team will be better off without her, and decides to leave. Just when she is about to leave Robin appears and starts to talk to her but just then, the aliens who sent the probes show up and take Starfire captive. Robin attacks their ship and sets her free, but just as the other Titans show up and prepare to battle, the aliens announce that they are Centauri police, here to capture a Tamaranean thief, who they say is Starfire because she's a Tamaranean and because she was wearing the Centauri Moon diamond that Blackfire gave her, but she'd never even been to the Centauri Moons. But the Titans know who has been to Centauri and that there's another Tamaranean on Earth. Seeing the Centauri Moon diamond on Starfire, Robin realizes they must be talking about Blackfire because she's been to the Centauri Moons; that's where she'd gotten the diamond, and she told Starfire herself. It all turns out that Blackfire had stolen the diamond and gave it to Starfire and was only pretending to be the Titans' friend so she could get away with her robberies in Centauri and let her sister take her place in jail. The Titans find that Blackfire is trying to escape Earth to return to Tamaran. Starfire, enraged, flies after her sister, and engages her in combat long enough for the Centaurians to capture her. Blackfire is taken away by the Centauri Police, vowing revenge on her sister. The scene changes, and Starfire is shown sitting alone when Robin joins her. He encourages her by saying that no one will be able to replace her, which reveals a smile on her face.
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- All Tamaraneans look like Starfire with the orangish skin, green eyes and red hair. Although, Blackfire seems to look different than the rest of her kind. This is likely a reference to her comic counterpart being born deformed by Tamaranean standards.
- Referring to the fact that Starfire and Blackfire are sisters.
- This episode features the first appearance of Blackfire, and the only appearance of the Centauri police.
- In this episode, Titans Tower is shown to be somewhere near the Great Lakes by the Centauri police. However, in "Homecoming - Part 2", it is shown to be in California. The location in this episode may just be an continuity error.
- In "Date with Destiny", Robin says that he danced once and disliked it. But in this episode, he is shown dancing with the other Titans except Starfire and he doesn't show any hatred, meaning the former was likely just a failed excuse to not dance with Kitten.
- This is the first episode focusing on Robin and Starfire's mutual romantic feelings for each other.
- Before Cyborg grabbed the alien probe, we can see his left ear is human instead of metal.
- After he grabbed the thing's tentacles, we can also see the circuitry part on the right side of his bald head is missing.
- When Starfire shot a bright green starbolt at a drone, she did no damage whatsoever. However, when Blackfire used her light purple eye-beams, she easily destroyed both drones in seconds. This is likely because of Blackfire's energy-projection abilities being much stronger than Starfire's bright green ones.
- When Kai told the Titans that they're all under arrest, Starfire's armband disappears. When Cron said that Starfire had committed high crimes throughout Centauri and Starfire said she'd never been to Centauri, her armband reappears. Then when Robin gave Kai and Cron the stolen diamond Blackfire gave Starfire and said they've been chasing the wrong girl, Star's armband disappears again. Then when Starfire and Robin are talking on the roof when she first folds her arm she has her armband. When she unfolds them her armband disappears for the rest of the episode.
- At the end of the episode when Starfire and Robin were speaking, she is depicted with her gloves on, but Robin tells Starfire that nobody could replace her, Starfire is seen without her gloves.
- When Starfire tries to recite her six thousand verses of Gratitude, Cyborg's eyes are both normal ones. This was more than likely done to promote comedy; his robotic eye's pupil was colored red, so this may have been intentional. However, this may just be an animation error.
- When Beast Boy and Cyborg are playing the racing video game, Beast Boy is in front even before Cyborg says that he passed him.
- When Blackfire makes her way among the crowd and says "Step aside, Earthlings, the queen of the galaxy has arrived!", her mouth was gone for a split-second.
- In the shot of Starfire and Robin after the drone was destroyed, her armband is on the left side rather than the right.
- When Blackfire sits on the sofa, Cyborg's circuitry part on the right side of his bald head is missing again on his head. We only see it misplaced near his head.
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