Syfy's 'Helix' infects Steven Weber and Matt Long

Production on the series' second season underway in Montreal

Syfy announced Steven Weber ("Wings") and Matt Long ("Mad Men") have joined the cast of its mysterious viral thriller "Helix."

The second season of "Helix" finds the doctors of the Centers for Disease Control, still haunted by the Narvik outbreak and the events that took place in Arctic Biosystems, investigating a deadly outbreak of a new disease on a Windjammer cruise ship. Their investigation leads them to a mysterious island inhabited by a cult with the hope of creating a utopian society.

Filming for the series' 13-episode second season is currently underway in Montreal, Quebec.

Weber, who joins the show as a recurring guest star, will portray Brother Michael, the charismatic leader of the cult. Magnetic and charming, he is brilliant speaker and sermonizer, but also a first-class geneticist.

Long, who joins the show as a series regular, will play Dr. Kyle Sommer, the newest member of the CDC team, a world-class toxicologist whose charm matches his sharp intellect. A preacher's son from Texas, he is quick with a story or a joke, able to ingratiate himself into any group.