Grant Gustin, whom you might recognize as Glee‘s Sebastian, has officially been cast as Barry Allen (aka The Flash) in The CW’s hit show Arrow. Gustin will appear in episodes 208, 209, and 220.

Barry Allen is described as “a Central City assistant police forensic investigator who arrives in Starling to look into a series of unexplained robberies that may have a connection to a tragedy in his past. A comic book fan boy, Barry is obsessed with the Arrow unaware that working with Oliver and Felicity to solve the crime has brought him right into the dangerous world of the vigilante,” according to a press release.