The X-Files

In 15,000 B.C, a strange creature attacks a caveman. Cut to present day, a boy at the same North Texas spot falls into a pit and is contaminated by a black substance. When a bomb threatens the Dallas Federal Building, special FBI agents Fox Mulder and Dana Scully locate the device but are unable to prevent the explosion. Mulder and Scully must fight thr government in a conspiracy and find about colonization of Earth