Livewire is back wanting revenge, Team Guardian comes clean to Kara and Mon-el also comes clean to Kara. But before we get to any of that, we have Kara taking Mon-el through some training or as Winn calls it Superhero kindergarten.
While there was some small blip in Mon-el’s training, Kara declares him ready to go out in the field. Kara tells Moon-el one tip and that is to protect the people no matter what.
Meanwhile, M’gann is starting to hear voices in her head. All of sudden M’gann is not herself and keeps chanting “Blood! Death! Beautiful War!” in Martian. Even J’onn can’t reach her. M’gann lets out a scream that breaks the glass of her cell. M’gann is brought to the medical bay of the DEO and Alex tells J’onn that she can’t find anything wrong with her. While her vitals are good, M’gann is dying as her brain is shutting down. Alex suggests to J’onn that one way to save her is to do a Martian mind bonding. J’onn refuses to do any bonding as he doesn’t want to save a White Martian and will be okay if M’gann rots. However, after Alex talks about forgiveness, J’onn decides to perform the bonding ceremony but wants Alex and Kara by his side for emotional support in case he relives the death of his family. During the bonding, J’onn sees M’gann who is reliving her part in the White Martian genocide of the Green Martian and her eventual betrayal of her people. M’gann tells J’onn that when they met all she wanted was to be his friend and ease his loneliness. J’onn does forgive her and the two emerge out of the bonding. M’gann is going to be okay but tells J’onn that what happened to her was a psychic attack and says that the White Martians are coming for her.
Back to our main action, Livewire is sprung from her prison from a fellow inmate and someone posing as a guard. Kara is unnerved by Livewire’s escape and is on edge at having her nemesis out there. Kara shares her anxiety with James who tells her that she is not alone and there are other heroes out there to help. James’ is trying to tell her that he is Guardian but Kara thinks he means Mon-el. The two get into an argument at how Mon-el isn’t ready to be out in the field but their fight is cut short when a news report comes on about Livewire attacking the NCPD.
Kara and Mon-el arrive and they see that Livewire actually isn’t her but the innmate that has gotten her powers. Also having Livewire’s powers is the fake prison guard. Kara orders Mon-el to protect the cops while she takes care of faux Livewire. Guardian arrives on the scene to get the cops to safety. Mon-el leaves his post when he sees Kara is in danger as she is being ganged up on by the two faux Livewire’s. Mon-el deflects one of the lightening strikes that hits Guardian and a cop. Kara goes over to check on the cop and Guardian to only discover that the vigilante is James.
At the DEO, Kara is very angry at James for going out there and risking his life as Guardian. James tells Kara that being Guardian gives him purpose and he knows he was meant to be helping people as Guardian and not to be in the shadows of Superman and Supergirl. The two don’t resolve their argument.
Kara is also angry at Mon-el for defying her orders. Kara then decides to confront Mon-el about his feelings for her. Kara mentions the kiss they shared and asks if Mon-el likes her. Mon-el denies the kiss and is silent on liking her.
The team learns learn that Livewire wasn’t sprung out of jail but instead kidnapped. We see Livewire being experimented on by a scientists who is taking her powers to try and create super soldiers for the government.
J’onn asks if Winn knows where LIvewire is but he says it will take sometime as the fake Livewires are making it difficult. However, Winn does know and wants team Guardian to bring LIvewire in to show Supergirl what they can do. Mon-el overhears their conversation and joins them in trying to save Livewire.
At the warehouse, Guardian and Mon-el give it the college try but are captured by the scientist who plans on giving Livewire’s powers to them. When things went south, Winn calls in Supergirl for reinforcements. Supergirl frees Guardian and Mon-el who battle the faux Livewires while Supergirl frees Livewire. Livewire, with revenge still on her mind, is ready to kill Supergirl but she manage to convince her to join forces to bring in the scientist.
The two do manage to take down the scientist and Livewire is ready to kill him but Supergirl tells her that he needs to be brought to jail. In exchange, Supergirl agrees to let her go but eventually will bring her in too.
Back at the DEO, Winn and James tells Kara again how being Team Guardian gives them a sense of purpose and hopes they can work together and be a team. While Kara admires them, she cannot condone Team Guardian when they keep putting their lives in danger.
Outside Kara’s apartment, she finds Mon-el there. The two talk inside and Mon-el confesses to remembering the kiss and that he defied Kara’s orders is because she cares about her. Despite Kara saying she cares for Mon-el too, he knows it isn’t in the same way and understands. Mon-el is fine with just be Kara’s superhero partner. Mon-el really didn’t let Kara get a word in and tried play off his feelings with a joke but the show is so going there with those two.