As time goes on for the team, with Superman around, Kara has started becoming cocky with Clark always there to help.
On the plus side, with him around, Peter and Gwen had more time to focus on their wedding plans.
"Team Krypton was just having #toomuchfun." The two hear Kara say as they come back. "I mean, I've always loved being Supergirl. But today..."
"Next time it would be nice if you followed protocol and alerted us that an alien combative was no longer an active threat." J'onn tells Kara. "Your cousin may not work for the DEO, but you still do."
"Sorry." Kara apologizes. "We were...We we're just having-"
"#toomuchfun." Peter says as he joins them. "Yeah, we heard you." He says when the building gets a power surge.
"Energy drain coming from the holding area." Gwen informs them. "You know, again."
They go to the holding area where their new guest is being checked on.
"It started happening last night." Winn tells them.
"All energy resources at the DEO suddenly diverted to him." Gwen finishes when Clark notices the kryptonite.
"You're exposing him to kryptonite?" Clark asks J'onn. "He's a survivor. Not a prisoner."
"It's a precaution." J'onn informs him. "We don't know anything about him." He states when the power comes back on.
"His vitals have jumped again." Winn tells Gwen.
"At the same rate as all of these power drains." Gwen replies.
"He's repairing himself at a cellular level?" Clark asks them.
"Like photosynthesis." Gwen confirms. "His cells are absorbing the electrical energy and converting the to chemical energy."
"I should go." Clark says and leaves.
With him gone, Kara looks towards J'onn. "I know you two aren't the best of friends. But you promised you'd be nice to him while he's here." She reminds him.
"To be fair, his exact words were try." Peter reminds her.
"How...How is it hard to be nice to Superman?" Kara asks him. "He's Superman."
"If it means so much to you, we will get along." J'onn promises before leaving.
Peter then starts walking away as Kara and Alex talk about their sister night and Kara rushes over to Peter.
"Hey, you mind if I ask you something?" Kara asks him. "Why is it Clark is the big man and I'm Skirt?" She finally asks.
Peter just stops and smiles at that's what's bothering her before turning to face Kara. "Because he's literally a big man. And you wear a skirt for no real reason." He explains to her.
"Come on." Kara protests.
"I'm sorry, but compared to me, he's big. He's one of the few people I literally have to look up to. You are one of the dozens of people I am at eye level with." Peter informs her. "Hence big man, and why you are Skirt."
-
That night, the Danvers sister night was interrupted by someone with a kryptonite chestpiece, and a metal skeleton who called himself Metallo.
His chest was able to shoot out blasts of focused kryptonite that was able to weaken Clark and Kara until Clark was able to shoot him away before returning them to the DEO.
"You told me that only the DEO had access to kryptonite." Clark tells J'onn. "So how would you like to explain what just happened out there?"
"I wanna know who sees kryptonite and thinks, let's turn this into a robot." Gwen wonders.
"I was thinking the same." Peter whispers to her.
"A shipment went missing four months ago." J'onn informs him. "We've done all we can to find it."
"Four months ago?" Kara asks.
"Went missing?" Clark also asks.
"It was stolen." Peter weighs in. "We thought it was an inside job but everyone in the transport came up clean."
"So you have a mole?" Clark replies to that.
"We don't know that." J'onn tells him.
"If you'd gotten rid of it when I told you to..."
"We would have been helpless when Non and Astra launched Myriad. Or have you forgotten that there was a force even the Man of Steel couldn't defeat?" J'onn asks Clark and he places his hand on his chest.
"Superman and Martian Manhunter are gonna fight. This is terrible." Winn squeals. "This is awesome."
"My moneys on Manhunter." Gwen tells him.
"We have given our lives to protect the people of earth. If you cared about Kara at all..." Clark was saying, causing J'onn to get angry.
"Watch what you say." J'onn warns him while grabbing him back.
"Or what?!" Clark asks when all of their computers go crazy and a message appears.
"People of National City. The earth has been stolen from us. And the enemy has come in the guise of heroes." The voice says and shoves photos of the team. "They say they come in peace, to protect us from ourselves. But how long will it be before these God's decide to rule instead of serve? We are the antidote to their poison. We are the scientists who will show them what humans are capable of. Those who have sided with the invaders will not be sparred. You cannot stop us. We are everywhere. We are Cadmus." The video says before shutting off and the screens go to normal.
"Cadmus?" Peter asks.
"Announcing themselves to the world." Winn adds.
"And just declared war on extra terrestrials." Gwen adds.
"They turned John into Metallo to fight the two of you." Alex tells them.
"And Metallo isn't flesh and blood anymore. These people gave him a metal endoskeleton." Clark tells them.
"Traces of the alloy had to end up on your hands when you punched him to kingdom come." Peter says.
"I can analyze it at the Fortress of Solitude." Clark assures them.
"Agents Stacy and Shaw, go get the anti-kryptonite technology out of storage." J'onn asks Winn and Gwen. "See if you can improve upon it for our two friends."
"I get to help make Superman's new suit?" Winn stutters out.
"No pressure." Gwen says while patting him to follow her as J'onn and Clark leave for the Fortress.
-
What they were able to get form the alloy was that it was promethium, the strongest metal on earth. The same metal that Gwen used to create the Kryptonian-Slayer's.
"Get to scanning the city for promethium within a hundred mile radius." J'onn tells Gwen who is back at her computer.
Gwen does her thing and quickly finds it.
"This gets easier and easier." Gwen says as she gets a location.
"That's an industrial district. Cadmus can't be stationed there." Peter tells her.
"At the moment that means Metallo's on his own." Clark replies.
"Those suits are very nearly totally ready." Winn informs Clark. "And by that, I mean they're in no way ready."
"We're gonna have to go without them." Clark says. "We might not get this chance again, we'll stop him." Clark says meaning he doesn't need/want Peter's help as he leaves.
"I feel a bit betrayed and unneeded." Peter tells Gwen.
-
Once Clark and Kara got there, they fought Metallo when they learnt Cadmus created a secondary Metallo and sent him to attack Metropolis.
So they left John's Metallo and chased after the second one only to arrive to Kryptonian Park too late as Metallo already destroyed it and escaped.
As for back at the base, Winn explains how kryptonite leaves residue that is easily traceable. That gives Alex the idea of finding out who stole the kryptonite, and gave it to Cadmus.
Winn and Alex decide to go as Gwen finishes up the anti-kryptonite technology for the Super's. They learn it was Agent McGill, who had no reason to have kryptonite on him. Since he wasn't part of the team that moved it, has to be the mole working for Cadmus.
Staging a trap for him, Alex puts a transport together for kryptonite and plans on following him, and bring Peter as backup.
Kara later returns to the DEO to see they're missing.
"Winn, have you seen Alex or Peter?" Kara asks her friend.
"Alex..Alex Danvers and Peter? Peter as Spider-Man?" Winn asks nervously.
"Yeah, I needed to talk to Alex and I can't seem to find Peter." Kara explains.
"Well, they're not here. Maybe they're with Gwen." Winn offers as a solution.
"No, I already looked. Winn, where are they?" Kara asks, knowing he's hiding something.
-
With Alex, McGill was pulling the kryptonite stash into a warehouse that must be his meet up point for Cadmus.
"Freeze!" Alex warns him as she and Peter approach him with their weapons raised.
"It's not what it looks like, Danvers." McGill tries defending himself.
"Yeah, that's what they all say." Peter tells him.
"Here's what's gonna happen, we gonna bring you in. Once there, you're gonna tell us everything you know about Cadmus." Alex tells him.
"No, I'm not." McGill says when another gunshot goes off and they turn to see they're surrounded by Cadmus Agents.
"Agent dangers of the DEO, and Spider-Man. Nice to meet you." The woman in charge tells them. "I'll tell your father you say hello." She tells Alex which confuses her.
"My father?" Alex asks, confused to hear he's alive. "Where is he?"
"I suggest you die remembering him as he was. It's better that way. Unless the you care to join him. Cadmus welcomes any bright minds willing to help our cause." She tells them.
"My father would never collaborate with you." Alex states as Peter keeps his repulsers aimed at them.
"Okay, let's get this show on the road." Peter says before shooting her and the agents start trying to fight the two of them off.
Alex starts shooting as their leader makes her get away and the two of them fight off the rest of her agents like their nothing when Kara suddenly comes flying in.
"Five minutes too late, Skirt." Peter informs her.
"I didn't come here for this, I need your help with Metallo." Kara explains to him.
-
"Okay, so this job was a bit rushed, but these plates should stop Metallo from killing you." Gwen promises the Supers showing the plates.
"Nice work." J'onn compliments.
"What's the plan?" Peter asks Kara.
"Cadmus things that we are above the rest of the world, that we'll retreat to our own cities, just wait for them to come to us. What they won't be expecting us for us to have backup." Kara explains to them.
"We're listening." Clark tells her.
-
Clark was back in Metropolis helping them clean up when Metallo-1 comes flying in ready to fight.
Metallo-2 was in National City waiting when Kara comes flying in.
"I told you I'd be back." Kara tells him.
"And I told you I'd burn you alive." John remind her before sending a blast her way and the chest plate protects her.
Metropolis, Clark gets the same blast but the same result.
National City, Kara then drops to the floor and throws a car Metallo-2's way and flies at him and she now doesn't have the plate on.
"Now it's time to punch your face." Kara tells him before sending a powerful punch to his face.
The two then began to fight when Metallo-2 punches her in the chest, sending her tumbling. He then picks Kara up and slams her into the ground.
Metropolis, Clark flies right at Metallo-1 as the kryptonite isn't affecting him until Metallo punches his chestpiece, damaging it.
Trying to fight off the kryptonite, Clark goes into punch when he gets beaten in and a little girl runs up and changes into J'onn.
"Strength in numbers." J'onn tells Metallo before throwing him.
National City, Metallo stands over Supergirl ready to finish her off when suddenly Kara comes speeding in and slams him off of Supergirl.
Suddenly, Supergirl begins to glitch to reveal Iron-Spider disguised as Kara.
"Yikes, my suit took a big punch." Peter informs Kara and sees the arc reactor was damaged.
"Think you can still take him?" Kara asks as she helps him stand.
"Let's finish it." Peter says as they approach John.
"Thought you could divide and conquer?" Kara asks Metallo. "You might work better alone, but we don't." She tells him and run in to fight him off. Peter sends two beams his way and starts melting his skin, revealing his exoskeleton.
Kara goes in and punches him in the face.
Clark spins and sends his Metallo flying towards J'onn who smashes Metallo into the ground.
Metallo punches Peter's arc reactor once more and it starts failing. But that gives him an idea. Kara punches Metallo, getting Peter free of him.
Metallo grabs the chest plate off of Clark and J'onn uses his phasing powers to take out his kryptonite chestpiece.
Peter opens up his suit to free the arc reactor and watches the two fight before he can see his opening.
"Skirt, time to blow." Peter tells her before throwing his arc reactor at Metallo and Kara lasers the technology for it to expode, and turns Metallo onto shards.
"Nice job." Kara says and raises her hand and Peter decides to give her a hi-5.
-
Now after Metallo is gone, J'onn has finally decided on getting rid of all the kryptonite on earth.
"All the kryptonite on earth, encased in lead. I trust you'll do the right thing, Superman." Hank tells him.
"Thank you." Replied Clark.
"I'm gonna miss those kryptonian-slayers." Gwen admits.
"I'm gonna miss being evenly matched to Skirt and Big Man." Peter says as Clark says goodbye to everyone and quickly hugs Peter.
"You're getting better at being..."
"Human?" Peter asks. "You got Skirt to thank for that." He admits as Clark takes the kryptonite and flies off.
"You have changed a lot in the past year." Gwen admits as Kara leaves to check on their guest.
"We've all changed in the past year." Peter says when his senses go off and they turn to see the visitor's awake and is choking Kara.
"Bad time to get rid of the kryptonite." Gwen states.
"Run." Peter pleads, not wanting hwe to get hurt and starts chasing the new guy as he leaps out the window and escaped.
"I should really keep my suit on me." He mumbles knowing he needs his web shooters to catch up with him.