|Directed by||Spencer Gordon Bennet|
|Produced by||Ronald Davidson|
|Written by||Royal Cole|
Ewart Adamson (novel)
Marshall J. Reed
|Distributed by||Republic Pictures|
|15 chapters / 243 minutes (serial)|
|Budget||$170,099 (negative cost: $207,856)|
Sea captain Jim Marsden is about to be hanged for a murder he didn't commit, and is rescued from the gallows by two of his crewmen. To clear the captain's name, they head for the island of Pulinan, where they believe the real murderer is hiding. During the search for the killer, one thing leads to another and Jim and the crew soon find that their troubles have just started. Investigating a possible hiding place of the killer, Jim encounters huge sea monsters in Haunted Harbor.
Haunted Harbor's official release date is 26 August 1944, although this is actually the date the seventh chapter was made available to film exchanges.
The serial was re-released on 26 September 1951, under the new title Pirates' Harbor, between the first runs of Government Agents vs. Phantom Legion and Radar Men from the Moon. It began a pattern of re-releasing an old serial between every new release, which lasted until Republic's last new serial was released in 1955. Three years of purely re-releases then followed.
Cline writes that this "jungle-horror-mystery-sea-story" includes all of the "cliffhanging tricks Republic could muster."