IN A SPECIAL CROSSOVER EPISODE, NEAL MCDONOUGH AND KELLI WILLIAMS FROM NBC'S 'MEDICAL INVESTIGATION' ARRIVE TO HEAD OFF MYSTERY DISEASE THREATENING NEW YORK -- RECORDING ARTIST WYCLEF JEAN GUEST STARS -- In a special crossover episode, Dr. Connor (Neal McDonough) from NBC's drama "Medical Investigation" and Dr. Durant (guest star Kelli Williams) from the elite N.I.H. team, are called into New York after a captured jewelry store thief who is AWOL from the Army displays unusual symptoms of an unknown contagious disease that is spreading fast -- and his accomplice is still on the run. Meanwhile, Cruz (Tia Texada) witnesses a gangbanger in her custody as he is gunned down by a 13-year-old boy and she senses a slick rival (as Marcel, guest star Wyclef Jean) is behind the murder. In addition, Yokas (Molly Price) has doubts about her former partner and a worried Carlos (Anthony Ruivivar) gets a pleasant surprise. Coby Bell, Cara Buono, Nia Long, Josh Stewart, Skipp Sudduth and Jason Wiles also star. TV-14