Lena explains that she was trying to help Sam get rid of Reign, and she didn't think that the DEO or government would help as they thought they wouldn't wanna help Sam and just use or dissect her.
They now have no way to track Reign, but Lena confesses Lex left some kryptonite behind that she used to hold Reign back if she were to get too powerful.
"Lena!" Kara calls out as she gets off the phone with James. "I've had your back so many times. When the rest of the world was ready to pass you off as the new lex Luther."
"My friend came to me. She was alone and afraid. I had to do something." Lena tells her,
"I need you to level with me." Kara asks of her. "Do you have any more Kryptonite?"
"No, it's all gone." Lena promises. "I used the last of it to keep Sam sedate." She says when suddenly the sun starts to get blocked and Kara starts to feel light headed and Peter catches her as she falls over.
"Skirt, can you hear me?" Peter asks.
Just as soon as she passed out, she wakes up.
"Hey, welcome back. What just happened?" Peter asks her.
"I saw Sam." Kara tells him.
-
So now, it's the Worldkillers are blocking the sun with dark magic meaning the world will die without the sun.
"How long have we got?" J'onn asks Winn.
"Two hours until totality." Winn answers.
"Then what?" Alex asks.
"Temperature drops 50 degrees, give or take." Peter answers.
"You said you dreamed of Sam." Alex reminds Kara.
"But people don't dream during a seizure." J'onn says.
"It's the same dream I've been having for the last year. I'm at Juru, normally I see the Worldkillers but I saw their human sides this time." Kara explains.
"It's not a dream, that valley's real." Lena informs them. "When I was working with Sam, she told me of this place. An alternate dimension that she would go to when Reign will take over."
"But how can she see it?" Peter asks pointing to Kara.
"On Mars, my people would share memories, emotions, experiences. Sometimes, you would experience a particularly strong mind wholly by accident." J'onn offers as a answer.
"Like picking up a radio broadcast?" Alex asks.
"But Supergirl just picked up an alternate dimension." Winn clarifies.
"It's possible. And if we can go in there, maybe we could wake Sam up and send a message to say where the Worldkillers are." Lena replies.
"There's still one big whole in this plan. How do we send Supergirl back to this valley?" J'onn asks.
"We fight fantasy with sci-fi." Kara informs him.
"I miss it when my life was normal enough for that sentence to be stupid." Peter states.
Brainy was able to as he says was actually easy to do, but he could only do it on the Legion Cruiser and Lena wants to help and Kara is skeptical and Lena says that she knows Reign and Supergirl doesn't, not knowing it's Kara and she is her friend.
"Were you able to tell if Lena was lying?" Kara asks Peter, referring to when she said she had kryptonite.
"She spoke the truth, she has no more kryptonite." Peter assures her. "You know, this could all be fixed if you told her who you were."
"I can't do that right now." Kara states, knowing there's too much going on to tell her.
"I'm not saying right now. I'm saying when you actually can." Peter explains as they go.
-
Brainy warned that Kara will be able to be sent, but Alex and Lena will weaken her power and connection. With that information, Kara drags Peter off to make him promise if things go sideways, and makes him promise that if things goes bad, pull them out but leave her.
Peter doesn't agree at first, but knows she's gonna win anyway and they're sent into the valley.
"This is Juru." Kara tells them and Alex hands them some sticks to use as weapons.
"This place bites." Kara says as she got a cut from the wood and they see Grace's human side is dead meaning Sam and Julia are not far behind.
-
"Fifty four minutes to totality." Brainy tells them.
Peter watches over Kara's vitals and how her head winces back and forth in pain and he leaves the room to stay calm.
J'onn follows him too se what's wrong. "Peter, you okay?"
Peter inhaled a breath of air before turning to him. "It's just...she looks breakable. I know she's strong, I just hate feeling helpless to help her. It...it reminds be of...you know."
"Yeah, that day took its toll on all of us." J'onn tells him, knowing he's talking about when Gwen died.
"I just wanna pull her out, but I know I can't. I can't help her, can't save her, can't hold her...it just hurts." Peter says and J'onn pulls him into a hug for comtort.
-
Back in the valley, they get attacked by some ghost witches as Kara and Lena get into an argument about the kryptonite and Kara wonders if Peter was right about telling her when this is over.
They stop arguing and manage to find Julia and tried to save her, and Lena was able to find Sam and they try to help her regain her strength to show them where they're hiding and Kara feels light headed.
-
Kara has only minutes left before this becomes lethal and Peter tells them to keep her in, keeping his promise.
-
Kara knows she's running out of time and they all remind her who she is and that seems to do the trick to wake her up and replace her with Reign.
"I'll break her neck." Reign warns them as she grabs Lena and lifts her into the air.
"Take me!" Kara pleaded.
"You? You're nothing. Only someone of equal strength can defeat me. You are driftwood in the face of a hurricane." Reign informs her.
-
In reality, they have a location and Peter orders them out and they did it at the last second possible.
They wake them up and make their way to the location. Once they make it to their fortress that's nothing but a bunch of large sticks.
Winn even gave Alex a new suit with some gadgets that will help her fight the Worldkillers.
Six heroes against three Worldkillers.
"Miss us?" Peter asks Reign as the six fly off to take on two each.
The fight goes on for some time as the Legion ship takes a few hits and Lena flies them to a safe distance with a plan.
Peter and Kara fight off Reign together as she slams Peter into the wall.
"You're weak." Reign stages and goes to punch him again when Kara stops her and slams her across the room.
Alex uses her new weapons on Purity and Pestilence to help fight them off.
The three do all they call to stop the three and the end of the world that's only minutes away from happening.
Kara and use her lasers on Reign as she is using all her power to keep her back as Kara ends up losing her powers.
"The eclipse is full. No more powers." Reign says.
"Only for her." Peter says as he approaches her. "Now, excuse me. But I have the feeling I earned this." He states before using all his suits power and strength to punch Reign, sending her across the room. "God, that felt good."
Mon-El Imra And J'onn keep fighting Pestilence and they see Julia is still down.
"It's over." Reign says when Purity stands up.
"The only one of equal strength can beat you? Well, come at me, witch." Julia dares as she regain control and tries to stop Reign but ends up getting killed by Pestilence. As her final action, Julia uses her powers to kill Pestilence and the two end up turning into mist.
The entire fortress starts to fall apart as the mist joins with Reign.
The heroes all escape as the sun returns and the fortress falls like it never existed.
-
Back at the DEO, they're still trying to see where Sam went to, but they have no leads and the two heroes are flying outside L-Corp.
"We'll find Sam, somehow." Peter promises.
"I know." Kara says and looks to Lena who's in her office. "I'm wondering if I should tell her."
Peter knows it's time for another one of his tales of Spider-Man to help her reach a decision. "When I first became Spider-Man, I didn't tell anyone because I didn't want them talking me out of doing it. Later on, I didn't want them to worry, then I didn't want things to change. I learned something, keeping secrets kills people. Sometimes figuratively, sometimes literally. I waited too long to tell my aunt about who I was...and she died. I don't keep this secret on purpose, it's just a second nature to me. Let me talk to her first, then you come in."
He flies up to Lena and congratulated her for her work and tells her Kara did overreact, and that heroes don't keep the secret from friends and family due to not trusting them, but because they're used to keeping it.
"And what do you think about me knowing it?" Lena wonders and Peter looks to her through his mask.
"This is how I feel." Peter says and he retracted his mask, revealing his face to Lena who's shocked. "Names Peter Parker, I'm Spider-Man." He says even though they met at the Christmas party.
"P...Peter Parker?" Lena asks, shocked he told her.
"Now when Skirt tell you, please don't...explode or anything." Peter begs and leaves the two to talk.
"So...well, like he said, please don't freak out." Kara says as she pulls out her glasses and places them on her face and Lena knows who she is.
"Kara? You're Supergirl!?" She asks shocked, but is trying to stay calm. "How did I not see that?! You...oh my god, I'm sorry for what I said."
Kara smiles, happy she doesn't feel betrayed or tell her to leave. "It's okay, you didn't know. Peter thought that I should tell you."
"Well, your boyfriend is smart." Lena says and Kara is suriprised she knows that. "Come on, I might've not known you two were heroes, but I see how you guys look at each other." She says and walks off to find a way to help or locate Sam.