The Event

The series premieres with a conspiracy of both national and global proportions.

The President's staff grapples with a new reality -- D.B. Sweeney and Heather McComb Guest Star.

The mystery deepens -- D.B. Sweeney, Clea DuVall and Heather McComb Guest Star.

The White House grapples with a mysterious biological threat. D.B. Sweeney, Heather McComb and Emmy and Tony-winner Hal Holbrook guest star.

The biological threat intensifies -- D.B. Sweeney and Heather McComb Guest Star.

New secrets are unearthed as loyalties are tested -- Paula Malcomson ("Caprica," "Deadwood") Guest Stars.

Family secrets interfere in the hunt for the truth -- Paula Malcomson ("Caprica," "Deadwood") Guest Stars.

Desperate times call for desperate measures - Academy Award nominee Hal Holbrook ('Into The Wild') guest stars.

Sophia and the President deal with traitors within their houses - Hal Holbrook guest stars.

Mistrust grows within both camps as strategies turn urgent -- Hal Holbrook ("Into the Wild") and Necar Zadegan ("24") Guest Star.

President Martinez and his Chief of Staff (guest star Roger Bart) charge the intelligence community with decrypting Thomas's satellite message, but more importantly determining to whom it was sent. Meanwhile, on the other side of the Capital, Alaskan Senator Catherine Lewis (guest star Virginia Madsen) begins her first day on the job. Sophia has an emotional reunion with Michael Buchanan. Elsewhere, Sean and Leila get a fresh lead on the whereabouts of Samantha, while Dempsey (guest star Hal Holbrook) foretells the future.

While President Martinez and his Chief of Staff (guest star Roger Bart) are distracted by the satellite message, Thomas unveils a surprise attack, but he does not anticipate a heroic stand-off with Blake Sterling, who learns an important lesson about Sleepers from Maya (guest star Clea DuVall). Meanwhile, newly appointed Alaskan Senator Catherine Lewis (guest star Virginia Madsen) threatens to divulge information about the Mt. Inostranka detention facility on an episode of "HARDBALL with Chris Matthews". Elsewhere, Sean and Leila get a fresh lead on the whereabouts of Samantha, but it leads them to a dramatic turn in their lives. James Dempsey (guest star Hal Holbrook) foresees that he and Sean will once again cross paths.

The White House vows never again, while Thomas plans his encore -- Roger Bart and Gabrielle Carteris guest star.

Thomas receives a troubling message -- Hal Holbrook and Gabrielle Carteris guest star.

Negotiations ensue for the release of the sleepers -- Hal Holbrook Guest Stars.

When diplomacy fails. Virginia Madsen and Hal Holbrook guest star.

A betrayal of the highest magnitude - Virginia Madsen guest stars.

Traitors at the highest level - Roger Bart guest stars.

In a race for their lives - Roger Bart guest stars.

Double agent with a counter agent - Roger Bart guest stars.

A triumphant return - Roger Bart guest stars.

In a race to stop the virus - Roger Bart and Roma Maffia guest star.