Writer:	L. Ford Neale, John Huff
Director:	Seymour Robbie
Star:	Simon Oakland (Tony Vincenzo),  Darren McGavin (Carl Kolchak)
Recurring Role:	Paul Baxley (Lawrence Earl Coogan (uncredited)),  Craig R. Baxley (The Creature)
Guest Star:	Margaret Avery (Ruth Van Galen),  Lew Brown (II) (First Detective),  Bill Deiz (Second Reporter),  George Finley (Dr. Phillips),  Frank Marth (Colonel Brody),  Tom Moses (Dr. Gordon),  Cliff Norton (Arnie Wisemore),  Keith Walker (First Reporter),  Albert Paulsen (Dr. James Verhyden),  Tom Bosley (Jack Flaherty),  Kathie Browne (Lt. Irene Lamont),  Frank Campanella (Ted Chapman),  John Hoyt (Dr. Beckwith),  Kelly Wilder (Receptionist)

This is one of only two episodes that Jack Grinnage doesn't appear in. (edit) This is the only episode that begins in the middle of the action. Instead of the usual postscript dialogue into the tape recorder, we start with Kolchak in a golf cart racing away from the pursuing monster. (edit) Lt. Lamont gives Kolchak's yellow Mustang a nickname - "The Yellow Submarine". (edit) Kathie Browne, who plays Lt. Lamont, is Darren McGavin's
real-life wife. (edit)

Kolchak: You know, if all the film that I've shot that's been confiscated by the cops were laid end to end, I'd have enough film to shoot War and Peace. Including a travelogue and a cartoon. (edit) Kolchak: (closing narration)I know what's gonna happen now. As far as the authorities are concerned, the events of April twentieth and twenty-first will never have occurred. They-They're gonna tell me that if I ever breathe a word of this, they're gonna break me like a straw man. Now what about the sentry? Will its eggs hatch in the warm, dark dank dampness of its nesting place? Who knows? Maybe the government will find the nest, maybe they won't. We'll probably never know. But if you're in the subway or in a pedestrian tunnel underneath a ballpark and you think you hear something moving in the walls, it may not be your imagination. Take my advice, don't walk, run to the nearest exit. (edit) Kolchak: (opening narration) This is one story I may not get to file in person, so I'll have to talk fast - because it's after me. Claustrophobia has long been a part of the human experience from the Cro-Magnon all the way up to Freud. So if you ever happen to find yourself underground, and I mean deep underground, don't linger in the shadows. (edit)

When Dr. Beckwith is discussing the teethmarks in the autopsy, there are plumes of smoke wafting up from below him - cigarette smoke, apparently, or possibly a burning electrical cable. Either way, it shouldn't be there. (edit)

This episode does not have any allusions. Add some now!