Spoilers: Official Description For Feb. 5 Episode

From TheWB Media Site:

Monday, Feb 5 – (9:00 – 10:00 pm ET)
“Disturbing Behavior” TV-PG, D, V

A PARASITE INFILTRATES THE PLANET – While Michael (Brendan Fehr) and Maria (Majandra Delfino) flee Roswell after helping Laurie DuPree (guest star Allison Lange) escape from the police, Max (Jason Behr) learns that a deadly parasite was released into the Earth’s ecosystem when their ship crashed 50 years ago and contacts an otherwordly ally for help. Katherine Heigl, Colin Hanks, Nick Wechsler, Emilie de Ravin and William Sadler also star. James Whitmore Jr. directed the episode written by Ronald D. Moore (#2ADA13).