Kolchak: The Night Stalker - Season 1 - Eps 18: The Knightly Murders
Various Chicago citizenry are being killed with medieval weaponry. Upon investigating, Kolchak finds that they were all tied to the conversion of a small museum into a disco. It turns out that the museum houses the armor of Guy de Metancourt, a misanthrope who swore upon his death that his final resting place would never know gaiety and laughter. Now, his ghostly armor animates and kills those who would disrupt his resting place. The only way for Kolchak to stop the unchivalrous knight is to destroy it with a holy axe blessed by the pope.
About Kolchak: The Night Stalker

Title: Kolchak: The Night Stalker
First Air Date: 1974-09-13
Last Air Date: 1975-03-28
Status: Ended
Rating: 7.575/10 (from 80 votes)
Language: EN
Seasons: 1
Total Episodes: 20
Network: ABC
Genres: Drama, Mystery, Sci-Fi & Fantasy
Production Companies: Francy Productions, Universal Television, Dan Curtis Productions, ABC Circle Films
Synopsis
Kolchak: The Night Stalker is an American television series that aired on ABC during the 1974–1975 season. It featured a fictional Chicago newspaper reporter who investigated mysterious crimes with unlikely causes, particularly those that law enforcement authorities would not follow up. These often involved the supernatural or even science fiction, including fantastic creatures.
Cast

Darren McGavin
Carl Kolchak

Simon Oakland
Tony Vincenzo

Jack Grinnage
Ron Updyke