Barry just returned home, the Reverse Flash told him things won't be perfectly how they were, but anyways he enters Joe's house and sees Wally and Iris, they take a drink but then Barry asks where's Joe, which triggers them both but Iris calms Wally down and explains that when Barry's mother died he asked where his mother was.

Iris: Good night Barry.

Barry: Night.

Wally and Iris go upstairs to sleep, Barry sits on the couch realizing he made a big mistake. The next day he heads to Star Labs and sees his father, Henry Allen is alive.

He has a shocked expression on his face and goes to hug his father, then Eddie walks in who turns out to be alive as well. What is going on, Barry wonders. He is shocked to see him alive and well, this must mean Eddie is married to Iris, which he assumes by his wedding ring.

Eddie: Barry are you okay?

Barry: Yeah I'm fine, just a headache.

Henry: We just beat Zoom, it's going to be okay slugger.

Barry heads off to CCPD later to find out he is not a CSI but the Director of CCPD instead. After work he goes to CCPN to talk to Iris, and he finds out Linda Park is still there. He doesn't get all of this. Joe died in the hands of Zoom instead of his father, Eddie is alive and married to Iris, he's the Director of the CCPD, and Linda Park still works at the CCPD.

Barry runs away from the city surprised at all the differences and heads to the Arrowcave in Star City. He tries to explain to Felicity that he changed the timeline, and he explains all the ramifications, Felicity is surprised to find out things changed so much even though he reversed things back to what they were before. Barry then speed searches on the computer, and sees Diggle's profile.

Barry: Wait who's that little boy with Dig?

Felicity: Wait he didn't have a kid before?

Barry: He did he had a kid, Baby Sara.

Felicity: Baby John. It was named after his father's death.

Barry: He's dead?

Felicity: Oh my god it really can affect us.

Barry: I tried making everything better but I ended up making everything worse. I mean I don't even know how I can fix it.

Felicity: Maybe you should tell them.

Barry: Hey Layla, I'm the reason John is dead, sorry oh and by the way your kid was a girl. Yeah sure that can help a lot.

Felicity: Look I get it's really difficult not that I have experience but tragedy happens. When Laurel returned from the prison riot after Diggle died saving her-

Barry: Felicity, Laurel? Dinah Laurel Lance?

Felicity: Don't tell me she did not exist before.

Barry: She did, but not alive because Damien Darhk. Diggle saved her from Damien?

Felicity: Okay look Barry this is a lot to take in even for me, but maybe you should calm down. Go tell Team Flash first then gradually over here.

Barry: Yeah I guess you're right.

Felicity: NOW!

Barry: Right now?

Felicity: Yes!

Barry is frustrated, on the bright side he saved Laurel and Eddie's lives but in doing so he ended up killing Joe West, John Diggle, and possibly even more people.

Instead of listening to Felicity's advice, he attempts to run back in time to save Joe and Diggle, but is stopped by Jay who explains to him that he understands, because people from other Earth's, they have different timelines and Jay remembers the original timeline. Jay gives Barry a lecture on time travel, and Barry decides that its best he does not change time due to Jay's advice. He goes to Team Flash and sees Henry, Eddie, Cisco, Caitlin, Wally, and Iris.

Barry: I need to tell you all something.

Iris: About what?

Barry: After Zoom killed my dad, after we defeated him, I was not in a great space. And I thought the only way to fix things was to go back in time, and save my mom.

Everyone is confused at the fact that Barry said Zoom killed his dad, but when Barry said he went back in time to save his mother, they understood it.

Caitlin: You stopped the Reverse Flash from killing your mom?

Wally: So you created a whole new existence, how is that possible?

Barry explains on the whiteboard, then explains that he can't ever truly put things back to the way they once were. He then explains that in the original timeline, Eddie sacrificed himself to stop the Reverse Flash instead of Eddie shooting him, Henry died instead of Joe in the hands of Zoom, Linda did not work at CCPN, and he was a CSI not the Director of CCPD.

Henry: Barry this is a lot to take in.

Barry: Yeah. I know.

For the past 3 months, Barry has been living with those changes including the discovery that Cisco majorly enhanced his powers and Caitlin has powers now too plus the Speed Lab. He accepted Eddie and Iris' marriage, Joe's death, and all the other timeline ramifications. However he still did not tell Team Arrow about Diggle's death and child until when the aliens attacked and Jax and Stein showed Barry a message, with Oliver also being there.

Oliver: Barry what the hell does this mean?

Barry: It means I screwed things up when I changed the past.

Stein: What did you do?

Barry: I went back in time and saved my mother, I created a new timeline called Flashpoint and I lived in it for a few months but I realized I made a big mistake and I tried to make things back to the way they were but it didn't work.

Stein: What changed since you did this?

Barry: Joe is dead instead of my father, Caitlin has powers, Dig has a son now instead of a daughter,...

Barry's voice breaks as he says the final part of his newly discovered timeline ramifications, he can't believe John's life is over because of him.

Barry: ...and Damien Darhk ended Diggle's life instead of Laurel's. I'm really sorry.

Oliver: John was alive?

Barry: Yeah.

Jax: Well we have to tell them.

Oliver: We are going up against a bunch of aliens and you want to tell people their lives have been affected by time travel? One Sci-fi problem at a time! You made a mistake Barry, its part of the job. But we can't deal with it today.

Barry keeps it secret and since Cisco never is mad at Barry, he does not get him to tell everyone, and instead it is kept secret all the way until a few days later where an agent reveals that the Dominators are here because Barry messed with the normal course of time and created Flashpoint.

Agent: You did Mr. Allen.

Ray: He knows who you are

Barry: Me?

Agent: You used your powers to upset the normal course of time!

Ray: What is he talking about?

Agent: If Mr. Allen surrenders himself, then they will leave us in peace.

When everyone heads back to the Hangar, instead of Barry making a statement to sacrifice himself, he explains flashpoint.

Ray: Barry, what are you hiding?

Barry: Jax and Professor Stein found a message from me in the future, saying that right now I can't be trusted.

Sara: And why would future you say that?

Barry: I went back in time and changed the timeline and now things here are different from before I left, including some of your lives.

Kara: Some of our lives? Like who?

Barry: Caitlin, Wally, my father, and um. Laurel.

Laurel: Wait what about me?

Barry: In the original timeline, Damien Darhk ended your life not Diggle's and he had a daughter not a son.

Laurel: Oh. So you just replaced a member of our team with me.

Barry: Yeah. I'm really sorry about this.

Ray: All these past few months we've spent traveling through time trying to correct these aberrations, you thought you could create one of your own?

Jax: We should've told him before.

Sara: Barry. Was my father alive in the original timeline or not.

Barry is surprised he did not know that Quentin is dead, he apologizes so badly to Sara and Laurel, and says that her father was alive in the original timeline.

After they decide not to trust Barry in the battle, Kara talks to Barry after this.

Barry: Still trust me right?

Kara: I will always trust you, but it can be a little more for them.

Barry: Thank you.

Kara gives Barry a hug, Oliver then stops everyone and explains they need Barry, they decide to go with Barry instead. After stopping the dominators, Laurel talks to Barry.

Laurel: Barry, I am not mad at you.

Barry: You're not?

Laurel: You did not kill my father, its a change in time, ever since Diggle saved my life by sacrificing his, everyone has been telling me I did not kill him and it still was not something I believed, until now I finally see their perspective. I am here for you.

Oliver: Laurel, lets go?

Laurel: I'm going to stay with Barry for a while.

Oliver: Sure?

Laurel: Yeah.

Barry, Laurel, Cisco, and Caitlin head off to Central City, Kara already left for her Earth, Oliver leaves with Felicity to Star City, and the Legends then go off on the Waverider.