Even DeVoe had a pretty well-defined ticking clock on our heroes by this point in his story. Yes, the previous episodeРІР‚в„ўs Groundhog Day-style adventure was heavy with Cicada, but it didnРІР‚в„ўt do a ton to move the narrative forward. Before getting into the merit of this instalment, itРІР‚в„ўs worth noting that the fight against this yearРІР‚в„ўs big bad, while ever-present, is starting to languish a bit and become pretty thoroughly unfocused. However, they take a small victory in the fact that it works when Barry impulsively suggests that they should offer the cure to Cicada.As the episodeРІР‚в„ўs title promises, two of The FlashРІР‚в„ўs more impressive villains battled it out in another departure from the main storyline of season five. Barry once again apologizes for using the cure, promising that it wonРІР‚в„ўt happen again. Iris finally returns to her office, when she somehow just learns about the battle between King Shark and Grodd. The duo communicates using the crown, and we learn that heРІР‚в„ўs now cognizant of his recent memories and seemingly in control. King Shark returns to his tank at A.R.G.U.S., as Tanya observes her new love. King Shark deals the final blow to Grodd, returning the crown to his head in victory.Р”В«ack at STAR Labs, Team Flash learn that Grodd will be put into medically induced coma to prevent another breakout. Barry and Nora, now back in action, work together to electrocute the crane using their powers, eventually sending Grodd to street level. King Shark eventually gets hung from a crane, which immobilizes him. King Shark confronts Grodd, and the two duke it out. Flash and XS are nearly able to knock the crown off of Grodd, but he incapacitates them with his increased powers. Meanwhile, Barry and Nora decide to try and stop Grodd. Joe and Iris visit a gym, and he encourages her to overcome her fear of Cicada by facing it. Joe offers to try and help her overcome this fear. At Jitters, Joe confronts Iris about the fact that Cicada knows who she is, which is why she refuses to go back to her office. She leaves abruptly after Joe brings up her new office. Iris tries to skirt the discussion, which seems to worry her father. He also suggests that someone might be still be working with Cicada. Joe is now back and up to date on the Cicada situation. Joe ReturnsР”В®lsewhere, Iris, and Cecile all discuss JoeРІР‚в„ўs trip to visit Wally in Tibet. Cicso uses his vibe powers to accelerate the dark matter, and King Shark is reborn. Shay offers to turn back into King Shark, but he learns that he wonРІР‚в„ўt be able to use the cure again if he does. Eventually, Grodd emerges at the city center with a plan to take control of the humans using the crown. Shay and Tonya eventually talk outside on a balcony, before the two share a kiss. Tanya observes Shay from afar, when Sherloque convinces her that she might love him. Grodd takes control of Caitlin and Cisco, and he escapes with the crown.Р”В¬isco and Caitlin recover while Lyla explains how Grodd escaped from A.R.G.U.S., and itРІР‚в„ўs also revealed that King Shark is able to resist GroddРІР‚в„ўs telepathic abilities. Later, Barry again tries to apologize to the two, but Gorilla Grodd appears out of nowhere. Cisco and Catlin confront Barry about his decision to force the cure on King Shark, which Barry defends as an attempt to save CiscoРІР‚в„ўs life. They also learn that the dark matter is replicating, forcing Team Flash to hold him until he gets another dose. Shay feels remorseful for his actions as King Shark, and ultimately takes responsibility. However, there is still dark matter in his brain, which another dose of the cure will solve. Labs, Shay wakes to learn that he is once again human. Shay emerges from the water in his human form.Р”В«ack at S.T.A.R. He eventually picks up Cisco, and Barry impulsively uses the cure on King Shark before he eats his friend. Upon arriving, they attach the crown to communicate with him. The signal is successfully boosted, when they get a hit that King Shark is at the wharf.

Once there, Sherloque suggests that Tanya has something to hide, but she asserts that Shay Lamden is just her patient. Labs, where they can amplify its signal and track King SharkРІР‚в„ўs whereabouts. Team Flash decide to take the crown back to S.T.A.R. As they attempt to chat with King Shark, he quickly escapes his enclosure after a fit of rage and swims away.

They learn about a РІР‚Сљtelepathic crownРІР‚Сњ that gives King Shark the ability to communicate with them.

Earth 2РІР‚в„ўs Shay Lamden) has made great strides in regaining the human part of his brain. They also meet up with Tanya Lamden, who reveals that King Shark (a.k.a. Team Flash visits Lyla at A.R.G.U.S where they attempt to talk King Shark into taking the cure.

Considering that theyРІР‚в„ўve agreed not to force it on anyone, Barry comes to the realization that King Shark might be a willing participant. Labs, Team Flash realizes that they need a volunteer to test out the newly synthesized meta human cure.

The flash season 5 episode 15