Mr. R.I.N.G. (1975)

Hailed as one of the best "Night Stalker" episodes, Mr. R.I.N.G. has Carl Kolchak writing an obituary for a scientist who happened to be working on a cutting-edge robotics experiment for the Tyrell Corporation. Under the guise of defending America's taxpayers, Carl tracks down Mr. R.I.N.G. (Craig R. Baxley), the titular Frankenstein monster.