Underworld

 is the 14th episode of the 2002 He-Man and the Masters of the Universe series. It originally aired on December 13, 2002.

Summary
In Subternia, He-Man, King Randor and Man-At-Arms must prevent Skeletor from attacking Castle Grayskull from below.

Moral
Prince Adam: "Leadership isn't just telling people what to do. It's about leading by example and standing up for what is right. Until next time."

Heroic Warriors

 * He-Man
 * King Randor
 * Prince Adam
 * Man-At-Arms
 * Man-E-Faces
 * Orko

Allies

 * Ceratus
 * Lord Dactys

Evil Warriors

 * Beastman
 * Evil-Lyn
 * Panthor
 * Skeletor
 * Trap Jaw
 * Tri-Klops
 * Whiplash

Locations

 * Castle Grayskull
 * Eternos
 * Lost City of the Ancients
 * Snake Mountain
 * Spelean Kingdom
 * Subternia

Creatures

 * Sand Worm

Cast

 * Cam Clarke as He-Man/Prince Adam
 * Kathleen Baar as Evil-Lyn
 * Garry Chalk as Man-At-Arms, Whiplash and Caligar Warrior
 * Brian Dobson as Skeletor and Ceratus
 * Paul Dobson as Man-E-Faces and Trap-Jaw
 * Michael Donovan as King Randor
 * Gabe Khouth as Orko
 * Scott McNeil as Beastman and Spelean Warrior
 * Richard Newman as Lord Dactys

Trivia

 * Paul Dobson is credited in the cast for voicing Man-E-Faces and Trap-Jaw even though neither character appears in the story.
 * Lord Dactys and Ceratus were both released as Mattel action figures in 2013 and 2015, respectively.