- "It's not easy being let down by our idols. Having someone who embodies our heroic ideals helps us believe that we can be heroes, too. Sometimes heroes fall. So, please, for your own safety, stay away from Supergirl."
- —Cat Grant to the citizens of National City.
|Kara turns on her friends and the citizens of National City after being exposed to Red Kryptonite which makes her malicious, dangerous, and mean. Also, Cat Grant appears on THE TALK to discuss Supergirl.|
Cat appears on CBS The Talk to discuss her relationship with Supergirl, and goes out of her way to praise her. Kara hears a little girl wearing a Supergirl outfit being bullied. She flies down to them, calls her a friend, using X-ray vision to find out her name, to the other kids' amazement.
Kara was watching the show when Cat interrupts, reflecting on how well it went. She wants to speak with Winn, and sends Kara to find him. Kara thinks he's hiding in the storeroom, but when she uses her X-ray vision, she discovers him making out with Siobhan.
Cat tells Kara that Lucy has quit. When she goes to James he said she broke up with him before he had a chance to tell her that Kara is Supergirl, but denies the break up as having anything to do with Kara or Supergirl.
Alex and Kara discuss the issue. Kara says she feels guilty and that she doesn't want to be a rebound girl. Alex attempts to make her feel better and cites "Kim and Kanye" to Kara's embarrassment. Miranda Crane comes to the D.E.O. to personally congratulate Hank, Alex and Kara for their efforts to fight alien threats. She plans to lobby for greater funding for their agency. She holds Hank's hand for a brief moment, which doesn't go unnoticed by the sisters.
Kara flies out to help a fireman trapped by debris in a fire. She manages to lift the debris off him. As she is about to leave, she staggers briefly, her face suddenly having glowing red veins, which quickly vanish. Shrugging it off, she flies off, not seeing the glowing red object underneath nearby debris.
The next day, Kara smashes her alarm clock and arrives for work at CatCo wearing somewhat more stylish attire than normal. Cat wanted Siobhan to search for replacements for Lucy, but Kara has already taken care of it, and was rewarded with a couple of club tickets.Later that day, Hank briefs the D.E.O. team on a gang of bank robbers who have turned to a Fort Rozz escapee, a K'hund, for added strength, though Kara does not seem interested and behaved flippantly. That night, the D.E.O. engages the K'hund and, as planned, they lure him toward Kara to finish him off. Kara easily gets the better of him, crushing his hand and stepping on his throat. However, she lets him go, saying he isn't worthy of her time. Hank and Alex know this isn't like Kara, but when they confront her, Kara lays into Hank for hiding his identity, saying every Kryptonian on the planet other than her cousin wants her dead. She walks out, and out of everyone's sight, violently punches a wall.
The next day, Kara arrives at the office in Cat's elevator, which shocks Winn, but Cat brushes it off. Siobhan reveals that she managed to get footage of Supergirl letting the K'hund escape. She tries to pitch it to Cat, but Cat isn't interested.
Alex manages to recapture the K'hund, who reveals Supergirl let him go.
Undaunted by Cat's rejection, Siobhan plans to sell the story to her old employer, the Daily Planet. However, Kara picks up her plotting with her super hearing, and lures Siobhan away from her desk long enough to print a copy of the email. When Cat learns about Siobhan's treachery, she fires Siobhan on the spot. She additionally made sure Siobhan would never get any work with Daily Planet either. Obviously crushed, Siobhan leaves the scene as Winn tries to comfort her and Kara mocked her.
Kara invites Winn and James to celebrate at a club. Kara arrives late, and persuades James to dance with her. She tries to come on to James, and trashes Lucy in the process. James realize that Kara isn't herself. Cat calls James and asks to see Supergirl.
Kara later flies to CatCo, and tells Cat she's no longer interested in being a hero. To prove her point, she hurls Cat over the balcony, and flies down to catch her just in time.James and Winn alert Hank and Alex about the changes in Kara. Hank cross-references Kara's last missions, and discovers the red substance at the fire site. Alex deduces that it is a form of synthetic Kryptonite from its radiation signature. Maxwell then arrives and admits it was his creation. While Maxwell is in custody, he reveals that the substance was Red Kryptonite. He created it in hopes of stopping Non's next attack—only to find out that it backfired disastrously and turned Supergirl bad by destroying her inner inhibitions. He does, however, offer to make an antidote. Cat reluctantly goes on air to declare that she can no longer stand behind Supergirl. Alex tracks Kara to her apartment, and finds Kara wearing a black uniform similar to what Astra, Non and their army wear. Kara lays into Alex, pouring out years of resentment. Alex warns her that she isn't herself. However, Kara is now mad with power, and says she feels freer than she ever did. Vowing to make those who don't already worship her do so, she flies off. Senator Crane convinces the D.E.O. that Supergirl is now a threat. Reluctantly, Hank dispatches a team to track down Kara. Maxwell finishes his antidote, and loads it in an energy gun for Alex.
The D.E.O. arrives to find Kara wreaking havoc on National City. Alex tries to talk some sense into Kara, but Kara violently attacks Alex. Seeing Alex in danger, Hank turns into J'onn J'onzz and engages Kara, distracting her long enough for Alex to fire the antidote. Hank is taken into custody.
Kara comes to, and is horrified at what she did under Red Kryptonite's influence; she couldn't stop it. A small relief was that she didn't kill anyone. Alex admits there was some truth to what Kara said, but promises to work on it.
Imprisoned, Hank tells Senator Crane that he is J'onn J'onzz, and refuses to answer whether he killed the real Hank Henshaw. Crane feels betrayed and walks out. Alex wonders why Hank didn't run, but Hank said he would do anything to keep Alex and Kara safe.
Kara tries to apologize to James, but James needs some space for a while. Later, as Supergirl, Kara offers to apologize to Cat, but Cat tells her that she needs to win back National City's trust first.
- Cat compares Siobhan's perception of discovering a video of Supergirl letting a K'hund get away to uncovering the Watergate scandal.
Behind the scenes
- In the DC comics, Red Kryptonite originally had a different effect on Superman every time he was exposed to it.
- The Khunds were originally introduced in the comics as enemies to the Legion of Super-Heroes.
- At Noonan's, Kara dumps a bowl of peanuts onto a bar-top and begins to flick them at bottles, breaking them. This is a direct homage to the movie Superman III where Christopher Reeve's Superman does the same thing under the influence of synthetic Kryptonite.
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