Ghost in the Machine

The hero "Nightshade" could be an amalgamation of two different Justice Society members who costarred with Jay Garrick/The Flash in the 1940s comic books. Dr. Midnite, a surgeon by day and vigilante by night, who fights crimes despite only being able to see in complete darkness. Midnite uses a variety of non-lethal weaponry like blackout bombs which knock out all light. He has an owl as a sidekick named "Hooty". The other character is The Sandman, not to be confused with the Neil Gaiman character of the same name. Wesley Dodds was the first iteration of The Sandman, who would receive dreams telling him of someone in need of help. With his sidekick Sandy, he would don a fedora and gas mask and use his non lethal gas gun to attempt to right wrongs. The character of Nightshade is a Doctor like Dr. Midnite while sharing a similar outfit to that of The Sandman. Also, given the time frame, the 1950s, while in the Silver Age of Comics would quite possibly be the Golden Age of this particular iteration of the Flash.

When Julio's computer starts malfunctioning (showing, among other things, scenes from Chow Hound (1951)), a data display on listing leptons has the word "muon" misspelled as "moun".

The Ghost appears on the screen before the credits, just like the hijacked TVs in the episode.

Edited into Flash III: Deadly Nightshade (1992)