Episode Detail: Trees Made of Glass, Parts 1 and 2 - Threshold
Debut: A government contingency analyst (Carla Gugino) investigates the arrival of aliens who threaten Earth. In the opener, an alien craft appears near a Navy cargo freighter in the Atlantic Ocean and most of the crew is killed. Dr. Molly Caffrey (Gugino) assembles a team that includes a NASA microbiologist, a physicist, a covert operative and an expert in languages and mathematics.
