 Tim arrives home a day earlier than expected from his Mexican assignment. Despite a Keep Out sign on his apartment door, Tim enters - it is his own apartment - and is exposed to a Martian virus, causing red striping across his face. Before Martin can give him the antidote, Det. Brennan stops by and sees Tim s striping. He automatically assumes that Tim has brought back a tropical virus and calls for an ambulance to take him to the hospital. Martin and Tim manage to elude Brennan once at the hospital, where Tim goes undercover, literally, by wrapping his head with medical bandages. Being unrecognizable, he is mistaken for a missing patient who is supposed to be in surgery, and is given a general anesthetic in prep for surgery. Martin manages to find Tim before he goes under the knife, but Martin now can t give him the antidote because of the possible dangerous side effect from the anesthetic. Tim now has to ride out the course of the virus, additional symptoms include emitting vacillating extreme hot and cold molecules, which in turn affect everything around him. So Martin has to keep Tim in isolation, all the while Brennan is still searching them out.