Sara had just arrived in the hospital.

Sara: Are you anything like my Laurel?

Laurel: Hardly.

After Sara moves past her, Laurel exits the hospital and gets onto the Waverider.

Ray: Laurel?

Laurel uses her sonic scream to knock out everyone in the team (some battles here and there), and she then takes the jump ship to April 8th, 2016.

When over there, she encounters Earth 1 Laurel on her way to the Arrowcave.

Earth 1 Laurel: What the hell is going on here?

Earth 2 Laurel: Don't go, don't do it.

Earth 1 Laurel: Who are you?

Earth 2 Laurel: I know you just returned from Iron Heights, and you are about to tell Oliver no sign of the idol. Look I'm not you, I'm Laurel of Earth 2. From the future. Okay?

Earth 2 Laurel is pissed that this is taking too long, she knocks out Earth 1 Laurel and takes her into the Jump Ship, making sure it's locked for the next 24 hours, and leaves a letter telling her everything in her hand.

Earth 2 Laurel then heads down to the Arrowcave bunker in her clothes and impersonates her successfully every moment.

Earth 1 Laurel wakes up the moment Earth 2 Laurel is dead, she reads the letter Earth 2 Laurel wrote to her and cries. She takes it in her pocket and runs off to the Arrowcave, arriving down she sees Oliver and Diggle.

Oliver: Laurel? This is a hallucina-

Diggle: Laurel?

Oliver: Wait How?

Laurel: I was saved.

Oliver is shocked and relieved at the same time, he hugs her.

Laurel: I died. But my doppelgänger from Earth 2, she travelled back in time yesterday before I came in to tell you there's no sign of the idol in iron heights. She tried to make me understand but I couldn't figure it out, it didn't make any sense so she knocked me out for 24 hours and left me this letter.

Laurel shows Oliver the letter. He reads it out loud.

Oliver: Dear Laurel of Earth 1. This isn't going to make sense right now but it will eventually. My name is Dinah Laurel Lance, I'm from Earth 2. Prometheus kidnapped me from Star Labs in December 2016, and got me to work against Team Arrow. Well, I was evil so it made sense, I spent the rest of that year working against them then after the end of Prometheus with Diaz too, all my terrible actions leading to Quentin's death in May 2018. I couldn't handle this and so I took the jump ship from the Waverider and I travelled back in time to 2016, in order to save you. Now that you are alive, Prometheus has no reason to take me from Star Labs and I never fight team Arrow and Quentin never dies. I hope you live a long and healthy life, way better than I did. Just make sure you go to Hub City in January 2017 to make Dinah Drake the next Black Canary, she's the best. Thank you. Your legacy inspired me greatly in the future, ironically your legacy is what saved you. Have a nice life, make sure to give the other letter with this paper to Quentin, I don't want you to have to explain all this to him.

Love,

Earth 2 Dinah Laurel Lance

Diggle: I need some fresh air.

Oliver: Dig.

Diggle is relieved that she's alive but is broken because his trusting Andy caused all this future stuff and heads out.

While Oliver and Laurel are talking, Thea and Felicity walk into the Bunker.

Thea: Laurel? Wait Oliver don't tell me you-

Oliver: No, here.

Oliver hands Thea the letter Earth 2 Laurel wrote to Earth 1 Laurel, which she reads with Felicity.

Thea and Felicity are in tears and they hug Laurel.

Oliver: Your suit is on the desk. Unless you don't want to.

Laurel: I don't know, this is a lot to take in to be honest.

Quentin walks into the bunker with a newspaper.

Quentin: Oliver, look. There's proof Laurel might still be alive.

Laurel: Daddy, I'm here.

Quentin drops the newspaper and hugs Laurel.

Quentin: Baby

Quentin: I don't understand.

Laurel: My doppelgänger travelled back in time, to rescue me. Here. She wrote you this letter.

Laurel hands Quentin his letter, it reads: Hi Daddy. I'm a doppelgänger of your daughter from the future, from Earth 2. In May 2018, I had been the worst person ever for a long time, and you were always there for me even though you lost your Laurel. You believed I could be redeemed. I went back in time to sacrifice myself to save her. You deserve your daughter, and I am really sorry I disrespected you in the future. You are the best father ever, I love you daddy. I hope your Laurel lives a long and happy life and you live happily ever after.

Quentin is shocked.

Quentin: Laurel I'm so happy you're alive. And I'm really sorry for anything. I thought I'd never see you again.

Laurel: Me too daddy. I love you.

Quentin: I love you too.

Quentin wraps his arm around Laurel.

Laurel: What about the world?

Thea: Oh right, now that Laurel is alive. How are we going to explain this to the world?

Laurel: We place it against Darhk's wife.

Laurel heads to City Hall, where the representative for Ruve Adams is still speaking. Suddenly, the media turns over on Laurel, where she reveals that she was stabbed by Damien Darhk however without revealing that she is the Black Canary, instead as Assistant DA Laurel Lance.

Oliver walks in when Laurel signals him to avoid anymore questions.

News reporter: Mr. Queen, do you have any comments on the situation?

Oliver: No I do not, but thank you.

Oliver and Laurel exit back to the Arrowcave.

Over the next two years, Oliver, Laurel, Felicity, Diggle, Curtis, Dinah, and Rene work together to stop Prometheus, Cayden James, and leading up to the Arrow Season 6 Finale- Oliver turns himself over to the FBI, and Quentin remains dead anyways, which causes Earth 2 Laurel to try and go back in time to stop Quentin's death but only succeeds in sacrificing herself to save Earth One Laurel, resulting in a time loop where Earth 2 Laurel always dies and Earth One Laurel lives.