|This article is about a/an episode in Himitsu Sentai Gorenger.|
The Red Coffin! The Mysterious Skull Mansion (赤い棺桶! ドクロ屋敷の怪 Akai Kan'oke! Dokuro Yashiki no Kai) is the fourteenth episode of Himitsu Sentai Gorenger. It is the last episode with Nobuo Tanaka as narrator, Tōru Ōhira would take over as narrator for the rest of the series' run.
The Gorenger try to stop a bizarre plot of a Masked Monster using hypnosis to trap Japan's top scientists within his mansion.
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- This episode aired on NET the same day episode 15 of Kamen Rider Stronger, Shadow's Trump That Calls Death!!, aired on TBS.
- This is the first Sentai episode written by future Sentai head writer Hirohisa Soda
- This was the first Gorenger episode to be rerun, airing again on December 13, 1975 between Ep. 33: The Red Target! A Fake Gorenger Appears and Ep. 34: The Yellow Spy Battle! You Saw the Power of YTC.
- The butler in Skull Mask's mansion is portrayed by Kenji Ushio (Ambassador Hell in Kamen Rider; the original Commander Hedder in Battle Fever J).
Himitsu Sentai Gorenger Volume 3 features episodes 13-18: Ep. 13: The Pink Secret! Defeat the Human Bomb, Ep. 14: The Red Coffin! The Mysterious Skull Mansion, Ep. 15: The Big Blue Fortress! Big Raging Variblune, Ep. 16: White Weirdness! The Eye in the Mirror, Ep. 17: The Purple Theme Park! A Demonic Cemetery, and Ep. 18: Horrible Black Crusaders! Attack According to the (Secret) Plan. 
Blu-ray Box 1 comes with 16 episodes.