[1] As the fourth season opens, Michael sits alone in a well-furnished room, where he meets his new handler, Vaughn (Robert Wisdom).

Vaughn agrees, but as they begin their search, Michael is duped into burning another domestic spy, a counter-intelligence agent named Jesse Porter (Coby Bell).

In the mid-season finale, Barrett reveals that the bible decodes a non-official cover (NOC) list naming the members of the organization.

The four track him through to the Dominican Republic and take back the list, which is stored on a thumb drive and already decoded by Sweeney's partner.

While this is going on, Sam and Madeline contact a United States Congressman (John Doman), whom they had met in a previous episode, for help.

The season ends with Michael being whisked away to Washington, D.C. to meet a man identified as Raines (Dylan Baker), who tells him, "Welcome back."

Seth Peterson reprised his role as Michael's brother, Nate, while Paul Tei returned as money-launderer Barry Burkowski.

Tim Matheson and Jay Karnes returned, in the same episode, as villains "Dead" Larry Sizemore and Tyler Brennen.

Other notable one-time guests included Adam Clark, Alan Dale, Benito Martinez, Burt Reynolds, Michael Rooker, Callie Thorne, and Frank Whaley.