Mer-Man grins in a dark cavern, trident in one hand and a small device in the other

LORD OF THE DEEP

Mer-Man

Mer-Man is the Evil Warriors' sea specialist, and the one villain Mattel's own packaging rewrites as a victim: the 2009 Classics cardback says he did not choose Skeletor, he was forced into service after rival ocean clans destroyed his kingdom.

Mer-Man is the ruler of Eternia's undersea realms and the Evil Warrior who commands the sea. Mattel's own name for him is Squidish Rex, and Mattel's own bio says he did not choose Skeletor: he was forced into service after losing his kingdom.

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1982
Year his first action figure appeared, carrying the card phrase "Ocean warlord!" that Mattel reused unchanged on the 2009 Classics release
3
Actors who have voiced him on screen: Alan Oppenheimer (1983), Scott McNeil (2002) and Kevin Conroy (2021), one of Conroy's final roles
17
Filmation episodes with Mer-Man on screen; he is a specialist, brought in when the plot goes to sea
2009
Year Mattel's Classics cardback named him Squidish Rex and rewrote him as forced into Skeletor's service rather than loyal to him

OCEAN WARLORD

Ocean warlord

Mer-Man was in the first wave of Masters of the Universe figures in 1982, and his vintage card front carries the same two-word treatment every early figure got: "Ocean warlord!" That phrase survived. Twenty-seven years later Mattel used it again, unchanged, as the card title on the Masters of the Universe Classics release.

What it does not tell you is which side of the word "warlord" he is on, and that turns out to be the whole question with this character.

The Filmation series had no doubts. Alan Oppenheimer voices him from 1983, and the show casts him as the villain who owns any story that happens on or under water. In "Teela's Quest" his Shadow Beasts stand between Teela and the story of her mother. In "Search for the VHO" he disrupts a voyage to Selkie Island to get at a sonic device. In "City Beneath the Sea" the disappearance of King Randor's food ships leads He-Man and Man-At-Arms into an undersea city as captives. He is also in the room for the big ensemble villain pieces, "Diamond Ray of Disappearance" and "Evil-Lyn's Plot" among them.

He appears in 17 episodes of the Filmation series, modest screen time for an Evil Warrior. He is a specialist, brought in when the plot goes to sea.

Mer-Man holds his trident and a small device, grinning, in a dark cavern
Trident in hand, "Search for the VHO."
Whiplash and Mer-Man stand side by side in the control room
Beside Whiplash, "Island of Fear."
Mer-Man looks on, cradling the glowing Pearl of Power
Cradling the Pearl of Power, "City Beneath the Sea."
Close-up of Mer-Man gripping a trident in front of pipework
Gripping his trident, "She-Demon of Phantos."
Mer-Man ferries the captive Queen Marlena by boat
Ferrying a royal captive, "Fraidy Cat."
Mer-Man surfaces to confront the intruders
Surfacing to confront intruders, "Three on a Dare."
Mer-Man speaks to Trap Jaw in the submarine
With Trap Jaw in the submarine, "Jacob and the Widgets."
Mer-Man lies tied in green vines under a glass dome
Trapped under glass, "Evilseed."
Mer-Man wades through water gripping a thrashing shark-like sea creature by its jaw and fin
Wrestling a sea creature, "Diamond Ray of Disappearance."
Mer-Man, brandishing a dagger, confronts Beast Man in a claw-lined cavern
Facing down Beast Man, "Prince Adam No More."
Close-up of Mer-Man's angry face, orange ringed eyes and bared teeth, against a dark background
Baring his teeth, "Teela's Quest."
Mer-Man stares wide-eyed beside a green-skinned figure
Wide-eyed alongside an ally, "The Shadow of Skeletor."
Mer-Man snarls with his teeth bared and his fin crest flared, in the 2002 series redesign
Snarling, "The Beginning Part 3" (2002 series).
Mer-Man swims through green water gripping his trident, in the 2002 series redesign
Swimming with his trident, "The Deep End" (2002 series).
Mer-Man stands on a ship's deck beside a merfolk guard, in the Revelation redesign
On the ship's deck, "The Most Dangerous Man in Eternia" (Revelation).

Mer-Man aboard the submarine, running an undersea scheme with Trap Jaw.

Mer-Man and Trap Jaw face each other in the submarine control room while Jacob and Teela sit together, looking ahead.

Clipped from our own copy of He-Man and the Masters of the Universe, Jacob and the Widgets (1984), 6:38 to 8:20, 1 minute 42 seconds. Nothing is added and nothing is sped up. Copyright Mattel.

MATTEL'S OWN WORDS

Squidish Rex, and the bio that makes him a victim

The Classics cardback, released in 2009, opens with the real name Squidish Rex and then gives the warlord a reason for serving: "Ruler of the undersea realms of Eternia, Mer-Man was forced to serve in the armies of Skeletor after his kingdom was destroyed in a battle with rival ocean clans."

Mattel's word is forced. The card has his kingdom destroyed in a war between ocean clans and him compelled into Skeletor's armies afterward, which makes him a deposed king rather than a recruit. Beast Man joined Keldor, and Trap Jaw was freed from prison by Keldor and later fought him for the top job; Mer-Man is written as the one who did not have a choice.

His enemies are other sea peoples, not the surface world. The war that ruined him was between ocean clans, and Skeletor is the consequence of Mer-Man's story more than its villain.

The card also says his allegiance with Skeletor brings him to the surface world more often than he would like, which is Mattel writing reluctance into a villain's job description. It closes by placing him in the sea of Rakash, waiting for Skeletor's call to arms.

VOICE CREDITS

Three actors, three eras

Alan Oppenheimer voices Mer-Man throughout the 1983-1985 Filmation series, confirmed in that show's own credited cast lists alongside his better-known work as Skeletor and Man-At-Arms. That Filmation Mer-Man is the one this encyclopedia treats as canon, and the later series are covered here as other versions of him.

For the 2002 series, Scott McNeil is credited as Mer-Man in the IMDb full credits for "The Beginning," on top of Stratos, Beast Man, Clawful and Ram-Man in the same series.

In Masters of the Universe: Revelation, Mer-Man is voiced by Kevin Conroy, one of the last roles he recorded before his death in 2022. The credit is often confused with others in the same cast: Chris Wood voices Prince Adam and He-Man in Revelation, and Beast Man is Kevin Michael Richardson.

THE FIGURES TO OWN

Two current options

Mattel's Origins Cartoon Collection release is the modern default, styled after the Filmation look, with the 2-inch Eternia Minis figure as the budget pick.

The figure to own

Masters of the Universe: Origins Mer-Man (Cartoon Collection)

Mer-Man got a Masters of the Universe Classics figure in 2009, carrying the Squidish Rex bio above, and has since appeared in the vintage, 2002, Origins, Masterverse and Eternia Minis lines, plus Revelation-era and collector-exclusive variants. Every release is in the archive below.

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IN BRIEF

Mer-Man, year by year

1982

First action figure released

Card title "Ocean warlord!" Mattel would reuse, unchanged, twenty-seven years later on the Classics release.

1983

"Diamond Ray of Disappearance" airs

His first Filmation appearance, September 5, 1983, in one of the show's big ensemble villain episodes.

1983

"City Beneath the Sea" airs

The disappearance of King Randor's food ships leads He-Man and Man-At-Arms into Mer-Man's undersea city as captives.

2002

"The Beginning" premieres

His debut in the 2002 series, where Scott McNeil voices him alongside Stratos, Beast Man, Clawful and Ram-Man.

2009

Masters of the Universe Classics cardback names him Squidish Rex

The card describes a king forced into service after his kingdom fell, not a willing recruit.

2021

"The Most Dangerous Man in Eternia" airs

His Masters of the Universe: Revelation debut, voiced by Kevin Conroy, where Mer-Man's Aquaticans ambush the party on the way to the Gate to Subternia.

Voice (He-Man and the Masters of the Universe, Filmation, 1983-1985)
Alan Oppenheimer
Oppenheimer also voiced Skeletor and Man-At-Arms in the same series.
Voice (He-Man and the Masters of the Universe, 2002-2004)
Scott McNeil
Credited as Mer-Man in the IMDb full credits for "The Beginning," alongside Stratos, Beast Man, Clawful and Ram-Man.
Voice (Masters of the Universe: Revelation, 2021)
Kevin Conroy
One of Conroy's final roles before his death in 2022.

Questions

Mer-Man questions, answered

What is Mer-Man's real name?

Squidish Rex, per Mattel's Masters of the Universe Classics cardback. It first appeared in 2009. The vintage 1982 card gave him only the subtitle "Ocean warlord!"

Is Mer-Man loyal to Skeletor?

Mattel's own bio says he had no say in it. He was forced to serve in the armies of Skeletor after rival ocean clans destroyed his kingdom, and the same card says surface duty takes him out of the water more often than he would like.

Where does Mer-Man live?

The sea of Rakash, per the Classics card. He is described as the ruler of Eternia's undersea realms, a title he held before he lost his kingdom.

Who destroyed Mer-Man's kingdom?

Rival ocean clans, according to the Classics card. Not Skeletor, not He-Man, and not the surface world. The card does not name them.

Who voiced Mer-Man in the 2002 series?

Scott McNeil, credited as Mer-Man in the IMDb full credits for "The Beginning," where he also voices Stratos, Beast Man, Clawful and Ram-Man.

Who voiced Mer-Man in Revelation?

Kevin Conroy, in one of his final roles. Kevin Michael Richardson voices Beast Man in the same series and the two credits are often swapped.

Does Mer-Man appear in either live-action Masters of the Universe film?

No. He is not in the cast of the 1987 film or the 2026 film.

Did Mer-Man ever get a Masters of the Universe Classics figure?

Yes, in 2009, carrying the Squidish Rex bio.

How often does Mer-Man appear in the original Filmation series?

In 17 episodes of the Filmation series. He is a specialist the writers bring in when a plot goes to sea.

Compiled by the heman.org desk from Filmation's credited cast lists and episode synopses, IMDb's full credits for the 2002 series premiere "The Beginning," the ItsAllTrue MOTU Classics bio checklist, and the site's 2026 and 1987 movie cast pages.

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