The Thinker (Neil Sandilands) going over the case of Becky Sharpe (Sugar Lyn Beard) and how three weeks ago she has a run of bad luck like her boyfriend cheating on her and losing her job. However, after managing to catcah a bus whose passengers include Deacon from last week’s episode and being exposed to a flash of light things are looking up for her.
Unfortunately things are looking down for Team Flash. Harry arrives from Earth-2 with a breakup cube from Jessie to Wally. When trying to catch a bank robber who we see is Becky transferring her bad luck to all those around her to successfully get away, the Flash gets her bad luck too and slips on marbles and is unable to catch her.
At STAR Labs, Cisco names her Hazard and soon enough bad luck befalls the rest of Team Flash. Barry sees Iris in her wedding dress and lose two of their wedding venues.
Harry, Cisco and Barry discover that dark matter is responsible for the new meta humans and find the source. Barry realizes when he came out of the Speed Force, he created a wave a dark matter that created a bus load of metahumans.
Barry finds Becky at Jitters and tells her she is a metahuman who is inflicting bad luck to others. Becky thinks it is people finally suffering the bad luck she has endured all of her life and warns Barry not to stop her or face the consequence.
Meanwhile, the Thinker and the Mechanic are observing Becky and the Mechanic wonders why they aren’t bringing her in. The Thinker wants to observe Becky more.
Also, Joe’s house needs $15,000 worth of plumbing work so Cecile suggests selling the house and getting a place of their own. Things get worse as the ceiling starts to leak. Joe confesses to Barry that Cecile wants them to sell and get a place of their own but Joe is reluctant because of the memories the house holds. Barry tells Joe that he will always have the memories no matter where he goes.
Harry and Cisco continue with their butting of heads that was we saw throughout season 2 Harry formed a Team Flash for Jessie on Earth-2 but Harry was being too Harry pushing the team and Jessie too hard that she kicked off the team and Earth-2. Hence Harry is on Earth-1 and promises to help deal with Hazard and will be on his way.
Barry believes thet Becky’s powers only work if you are near her but Iris thinks that they are cursed and calls Barry to a church. Iris, looking lovely in a white dress, asked Barry to come to the church in a dress shirt so they can get married. Iris believes that they are cursed and if they don’t get married now they will never get married. After the funeral service before them, the two try and get married but the priest get a really bad allergic reaction and the ceremony is stopped.
Back at STAR Labs, Team Flash sees that Becky’s bad luck is spreading because she is experiencing lots of good luck as seen with winning tons at the crap table. The more she wins, the more bad luck Hazard spreads. As if luck couldn’t get worse, a plane is going down, the leak at Joe’s has gotten worse and Cecile slips and falls on the wet floor and the particle accelerator is back online.
Cisco and Harry work frantically to try and stop the particle accelerator from going online, the Flash rushes to the casino to stop Becky but she is playing a $10 million slot machine and as it looks like she might win, things go the wrong way for Barry. Barry accidentally cuffs himself, the fire alarm goes off and people flee and a sign falls on him.
Harry realizes that the way to stop Becky is to let the particle accelerator go back online. When it does, Becky doesn’t win the big jackpot and the Flash cuffs her and sends her to the meta wing of Iron Heights.
Back at STAR Labs, Cisco invites Harry to re-join Team Flash on Earth-1 as he is family and I am glad he is as I love the Cisco-Harry dynamic.
Team Flash has also figured out that the dark matter affected 12 people on the bus and now that they got two, they now know how to find the others.
And it looks like we are saying goodbye to Wally because as Team Flash was dealing with Hazard, Wally went to Earth-2 to talk to Jessie on their break-up. Jessie just wanted to time to find herself so Wally has decided to do the same away from Central City. Wally is going to stay with a friend in Blue Valley. Wally says good bye to the team and has a tearful farewell with his dad and sister.
When Wally leaves, Harry comes to realization that someone is pulling the strings in all of this and wanting the creation of these new meta humans. The Thinker observes Team Flash coming to the realization through the Samaroid mask but believes that he is still smarter than them.
In the coda, Joe tells Cecile that he is ready to sell but she has a change of heart after hearing Joe tell her how the house was a great place to raise his kids. Cecile then tells Joe that she is pregnant and we leave with Joe’s shocked face.