Following Oliver's death and the events of the "Crisis", Iris, Allegra, Kamilla and Cecile, who have formed Team Citizen, continue investigating a secret organisation called Black Hole. Iris meets with an anonymous source who says that Black Hole is connected with McCulloch Technologies, but it’s CEO Joseph Carver denies these claims. Iris ignores Cecile's legal advice and decides to write her own story on Black Hole, prompting the latter organisation to hire metahuman Dr. Kimiyo Hoshi / Doctor Light to kill Iris. Meanwhile, Diggle arrives in Central City to give Barry his custom made mask he gave to Oliver from the first time they met. Barry notices a trace of Mirakuru serum on the mask, believing it contains a warning message left behind by Oliver for a new threat. The two investigate on Lian Yu only to discover there aren't any Mirakuru serums on the island. Back at S.T.A.R. Labs, Iris' team set up a trap for Dr. Hoshi, while Iris again confronts Carver and blackmails him on being involved with Black Hole, prompting Carver to call of the hit. Carver insinuates to Iris that his missing wife Eva McCulloch is connected to Black Hole. Later, Iris investigates McCulloch Technologies where she is pulled into a mirror. Still reeling from learning no other Earths were restored, Cisco decides to leave Team Flash after the Crisis made him feel guilty for taking the metahuman cure and leaves Nash behind with the team.