A well-connectedAmerican archaeologist disappears while exploring the lost Mayan city ofXitaclan -- and FBI agents Fox Mulder and Dana Scully are flown to the Yucatánjungles to investigate.

Not an ordinary FBI team, Mulder and Scully are assigned to the X-Files,the strange and inexplicable cases the FBI wants to keep hidden from scrutiny...thecases involving the paranormal, the supernatural -- and possibly, the extraterrestrial.

Based on a mysterious jade artifact and ominous local legends, Mulder decidesthere may be more to this case than simply a missing team of scientists-- namely ancient curses, blood sacrifices, and deadly reptilian monsterslost in the jungle since before history. Scully is more skeptical. Her priorityis to keep an eye on her partner and try to provide logical explanationsfor Mulder's unorthodox speculations.

Unbeknownst to the two FBI agents, the lost city of Xitaclan is the sceneof an impending three-way brush war between Central American drug lords,international smugglers who deal in looted Mayan artifacts, and a covertU.S. military commando team that has been sent to investigate, and destroy,a strange electronic signal received from beneath the ruins -- a signalaimed upwards, at the stars! Mulder and Scully must unravel the secret ofXitaclan and discover what has become of the lost archaeology team beforethese opposing forces converge on the forgotten ruins...and unleash a powerthat nothing on Earth can contain.