Stephen Weber and Matt Long are both headed to Syfy.

Weber (Murder in the First, Chasing Life, Dallas) will appear on multiple Helix Season 2 episodes as Brother Michael, the charismatic leader of a cult. He’s described as a brilliant speaker and sermonizer, as well as a first-class geneticist.

Long (Mad Men, Private Practice) will come on board as Dr. Kyle Sommer, a famous toxicologist and the newest member of the CDC team.

Helix centers on Billy Campbell’s Alan Farragut, a CDC member who is investigating a possible disease outbreak.

No word yet on when Season 2 will premiere, but you can always watch Helix online if you need to catch up.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.