Dekalog (1989)

S4E15 Secrets, Not Long Buried

Cyclops travels alone to the desert town of Skull Mesa, a unique place where humans and mutants coexist peacefully, to reconnect with an old mentor from his past. Upon his arrival, he finds himself stripped of his powers and discovers that the town is now under the tyrannical control of a deranged mutant. Shockingly, the residents seem too frightened to resist or fight back against this oppressive rule.