The tyrannical warlord who conquers Castle Grayskull and kidnaps Eternia's royalty. He relentlessly pursues the Sword of Power, kills King Randor, and traps Adam in a psychic limbo before his staff's power backfires, leading to his apparent demise.
Their conflict drives the central struggle for Eternia and the power of Grayskull.
Skeletor kidnaps Adam's parents, pursues the Sword of Power, and repeatedly confronts Adam before Adam defeats him.
Trap Jaw operates as a principal military subordinate of Skeletor.
Trap Jaw is described as Skeletor's lieutenant and enforcer, and he leads attacks for Skeletor.
Teela opposes Skeletor as a defender of Eternos.
Teela fights against Skeletor's forces and helps Adam escape from their attacks.
Duncan functions as a military opponent of Skeletor's conquest.
Duncan escapes Skeletor's prison, joins the resistance, and fights Skeletor's forces during the final battle.
Skeletor's assault removes Randor from power and leads to his death.
Skeletor's forces capture King Randor during the attack on Eternos, and Randor later dies beneath the collapsing ceiling.
Marlena is used as a royal hostage in Skeletor's attempt to obtain the sword.
Skeletor takes Adam's parents prisoner and later holds Marlena in his lair.
Evil-Lyn advises Skeletor while serving his campaign against Eternia.
Evil-Lyn is identified as Skeletor's primary lieutenant and counselor who proposes the ritual at Castle Grayskull.
She protects the mystical power Skeletor wants to control.
The Sorceress guards Castle Grayskull while Skeletor seeks its secrets and attempts a ritual there.
Moss Man becomes a casualty of Skeletor's attempt to locate Adam.
Skeletor threatens dissenters until they reveal who has the sword, and Moss Man is killed during this coercion.
Fisto unwillingly reveals Adam's location under Skeletor's threat.
After Moss Man is killed, Fisto gives Skeletor the information that Adam possesses the sword.
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Related entry on Wikidata (Q127111), public domain (CC0).