The OSSA discovers a spacecraft thought to be at least 300 years old at the bottom of the ocean. Immediately following the discovery, they decide to send a team down to the depths of the ocean to study the space craft.
Mulder and Scully, now taken off the FBI's X Files cases, must find a way to fight the shadowy elements of the government to find out the truth about a conspiracy that might mean the alien colonization of Earth.
When Quinn, a grouchy pilot living the good life in the South Pacific, agrees to transfer a savvy fashion editor, Robin, to Tahiti, he ends up stranded on a deserted island with her after their plane crashes.
When guardian angel Seth -- who invisibly watches over the citizens of Los Angeles -- becomes captivated by Maggie, a strong-willed heart surgeon, he ponders trading in his pure, otherworldly existence for a mortal life with his beloved.
When some very creepy things start happening around school, the kids at Herrington High make a chilling discovery that confirms their worst suspicions: their teachers really are from another planet! As mind-controlling parasites rapidly begin spreading from the faculty to the students' bodies, it's ultimately up to the few who are left – an unlikely collection of loners, leaders, nerds and jocks – to save the world from alien domination.