S10E3 · Mulder and Scully Meet the Were-Monster

When a dead body is found with its throat ripped open in the woods outside Shawan, Oregon, Dana Scully and Fox Mulder are called in to investigate whether it was an animal attack, a serial killer or just maybe a strange creature as described by eyewitnesses. Mulder continues to question his faith in the unexplained as he attempts to gather proof of the existence of the new creature he and Scully investigate before jumping to conclusions. During an inspection of a truck stop, Mulder, Scully, and an animal control officer named Pasha (Kumail Nanjiani) seemingly encounter the creature.

Eventually, evidence starts to coalesce, and Mulder begins to suspect that an individual named Guy Mann (Rhys Darby) is actually a murderous were-monster, capable of transforming into a lizard person. After confronting Mann, his suspicions are proven only half correct: Mann is not a man who turns into a lizard person, but rather a lizard person who turns into a human. Mann apparently became a shape-shifter after being bitten by a human some days before and laments the existential hopelessness of human life, full sentience, and modern society. In the end, it is revealed that Pasha was the true killer, and that Mann was simply in the wrong place at the wrong time.

Upon learning this, Mulder rushes to tell Mann, who quickly brushes off the news. He informs Mulder that he will be going into a 10,000 year hibernation, but that he was glad to have met Mulder. Then, before Mulder's eyes, Mann turns back into his original lizard person form and scampers off into the night. Mulder thus witnesses a paranormal happening, and his faith is renewed.