Official Description For May 21 Episode

From WB Media:

Monday, May 21 – (9:00 – 10:00 pm ET)
“”The Departure”” (TV-PG, D, L)

THE ALIENS SAY GOODBYE IN THEIR FINAL HOURS ON EARTH — Max (Jason Behr), Isabel (Katherine Heigl), Michael (Brendan Fehr) and Tess (Emilie de Ravin) struggle with goodbyes on what they believe to be their last night on Earth before they travel to their home planet. Max frantically searches for the killer that is still out there and threatens the lives of everyone they love. Shiri Appleby, Majandra Delfino, Nick Wechsler and William Sadler also star. Patrick Norris directed the episode written by Jason Katims (#2ADA21).