The Avengers (1961)

S06E24 Fog

On a misty evening, a member of the International Disarmament Committee is fatally attacked with a swordstick, leading everyone to suspect that the infamous Gaslight Ghoul, a killer from the 1890s, has returned. Now, Steed and Tara must race against time to apprehend the murderer before the committee faces a serious shortage of its members.