Starting with the third season, Nigel Bennett and Peter MacNeill as Frank Elsinger and Ray Donahue respectively are added to the opening credits, after having guest roles throughout the first two seasons. Peter Axon and Curtis Rollins continue investigating the Arch and try to get Anton back. As Peter convinces Lindsay to come back to the team, Praegar also returns to the team. Anton eventually comes back from the Arch and is in the hospital in critical condition. It's revealed that Anton's wife, believed to be dead, comes back from the Arch as well. The return of Nicole Hendricks solves a 12-year-old case in which Anton's wife and daughter disappeared after a car crash. In the two-part third-season finale, "Forever and a Day", Michael Kelley returns and informs the team of The Chairman, a mysterious figure who is believed to be evil and immortal and control a series of interlocking companies, including Veritec, Tessler Industries and the O.S.I.R. They then begin a secret case in which they discover the identity of The Chairman and exorcise the demon. The end of the third season marks the final appearances of many original characters, including Curtis Rollins, Frank Elsinger, Ray Donahue, Lennox Q. Cooper, and Michael Kelly.