The X-Files (1993 - 2002): Field Trip

After a day of hiking, a woman Angela complains that her husband Wallace left her behind and walked on ahead. Later in the shower she has a vision of being covered in yellow goo. That night as they embrace in bed, the scene changes to show their skeletons locked together in a field. Mulder and Scully are called in to investigate, Scully speculates that the couple were killed and their bodies boiled to remove all the organs and tissue in some sort of ritualistic killing. But Mulder notes that the couple's remains were found on Brown Mountain, North Carolina. Where witnesses have report strange lights around the mountain for hundreds of years. On examination Scully discovers a yellow goo on Wallace and Angela's bones. Meanwhile as Mulder combs the field where the couple were found looking for evidence, he encounters Wallace hiding in a cave. Wallace claims he was abducted by aliens, a claim backed up when a bright light appears and Angela is returned, recanting the same abduction story. Only Mulder can not figure out the skeletons. The bright light returns and Mulder walks in to it. Mulder's skeleton is later found in the field, but Scully senses something is not right, especially when the Lone Gunman and Assistant Director Skinner both agree with her ritualistic killing theory with out question. Mulder returns with actual proof of alien involvement. However Scully's investigation seems to indicate that the yellow goo is a digestive secretion from a plant and holds the key to the case.

• Season 6, Episode 21: Promo