Martin Odum has the uncanny ability to transform himself into a completely different person for each job. But he begins to question his own identity when a mysterious stranger suggests that Martin isn't the man he believes himself to be.

Martin, Crystal and Troy Buchannan go undercover when a chemistry teacher and his family are kidnapped. The case takes on urgency when it's feared the kidnappers will use the teacher to manufacture a deadly gas.

Martin poses as an international arms dealer to rescue kidnapped chemist Richard Hubbard and track the sale of VX gas. Before long, he connects with a beautiful arms trader and slips into a shadowy romance with her.

Martin is sold VX gas, resulting in the apprehension of the Colonel and Ana Paulanos. In response, one of the Colonel's minions releases VX on a crowded bus, and promises more attacks if the Colonel and Ana aren't released.

Martin is put on leave in the wake of a confrontation with the Colonel. Martin then begins to investigate his own past, discovering that an enigmatic smuggler in Houston may have the answers he needs.

Fallout from a shoot-out finds Martin taking Kyle Dobson into custody. Before long, Dobson's mysterious employers enlist hit men to retrieve a wounded Dobson, prompting Martin to plan a desperate escape with Dobson back to Los Angeles.

Martin returns to DCO after the events in Houston and is presented with the case of a threat to assassinate a visiting Saudi Prince. The investigation leads Martin and Rice to a beautiful and charismatic female rights activist.

Martin stays in legend as journalist Sebastian Egan to exonerate Hani Jabril and find the real assassins of Prince Abdullah. DCO is forced to pursue the investigation 'off book', ultimately leading Martin into his most dangerous stand off yet.

Martin manages to escape from an interrogation and finds out that Sonya and Aiden have been abducted. As he looks for them, he learns more information about his past.

Martin finds out that Verax could be plotting an assassination. He is also kidnapped and makes a stunning discovery about his own identity.

Season 2 kicks off with Martin Odum hiding out in present-day London and searching for clues about his identity with help from a CIA agent (Kelly Overton). Elsewhere, an investigation is launched into a Russian gangster.

Martin makes contact with a woman who may be linked to his past. Meanwhile, Dmitry embarks on a mission in 2001 Prague to find a wanted war criminal, yet concerns rise that Dmitry may be going too far with his infiltration techniques.

Martin races against time in a search for Kate in Paris. Meanwhile, Dmitry discovers a key to getting close to Doku Zakayev in 2001 Prague, and Ballard gets swept up in a life-changing incident in 1991 Lithuania.

Kate becomes a fugitive in modern-day Paris, so Martin puts her into hiding. Meanwhile, Ballard unearths information that could lead him to Martin, and Ilyana asks Dmitry for a dangerous favor in 2001 Prague.

Kate is offered a deal by Nina and an M16 agent in modern-day Paris, to Martin's chagrin. Meanwhile, Ballard convinces the FBI to allow him to take down Martin; Ilyana is enlisted as an operative in 2001 Prague; and Terrence's secrets emerge.

Martin prepares Kate for a perilous mission in present-day Paris. Meanwhile, Gabi confronts intelligence agents in Prague; a vulnerability in Dmitry is discovered; and Alex is recruited for a distinguished position.

Kate goes missing in present-day Prague. Also, Martin makes a risky proposition; Gabi learns that Blazek may have dangerous ties to Tamir; Dmitry is threatened in 2001 Prague; and suspicions rise about Terrence.

Martin works for Tamir in present-day Prague. Meanwhile, Gabi confronts Blazek about his shadowy activity; Kate is held prisoner in the president's compound in Chechnya; and suspicions rise about Dmitry and Ilyana.

A threat on a summit is investigated by Martin and Nina, who search for Tamir's associate in present-day Prague. Elsewhere, two assassins spin a deadly plan into motion; Tamir's wife gives orders to Beslan; and Dmitry struggles to complete his mission.

Martin makes a deal with the Russians to rescue Kate. Gabi struggles to make a decision about her husband. In 2004, Dmitry asks one last favor of Terrance. In 1972, the last pieces of the puzzle to understanding Martin Odum's identity are revealed.