Barry first encounters it during his travel through the time-tunnel, the wraith angrily flying at him. It later appears in Barry's office in the GCPD, much to the shock of the police officers in the precinct. They fire their guns at the wraith which is not affected by the bullets at all. After seemingly searching the precinct, it leaves.
It later resurfaces at S.T.A.R. Labs. To save themselves from it, Cisco and Caitlin lock themselves up in the cell of Hartley Rathaway. They eventually team up with Hartley who uses his gloves to drive away the wraith. Before it returns, Barry travels back into his time. Although it pursues him down the accellerator, Barry from the past tackles it down and the future-Barry returns to his timeline.
The Wraith then follows Barry into the future and proceeds to age him to death until Barry is saved just in time by Hartley Rathaway, who due to the changes Barry made in the past has reformed and blasts the wraith to dust with his sonic gloves.
During the final confrontation between Barry and Hunter Zolomon, Barry creates a time remnant that sacrifices himself to disable the artificial magnetar Zolomon was looking to power. This action provokes a pair of Time Wraiths, which attack the defeated Zolomon, who decays and is abducted by the Wraiths.