Appearing in "On the Brink of Madness!"
- Force (First appearance as Carl Walker/Force)
- Professor Henry Croft (First appearance)
- Dr. Joseph Jennings (First appearance)
- Fantastic Four (Only in flashback)
- The Four
- Dr. Strange (Illusion)
- Damon Walthers (Mentioned)
- Spider-Man (Cameo)
Races and Species:
- Neptune's Trident (Actually Neptune's)
- Force Armor (First appearance)
- New York City
Synopsis for "On the Brink of Madness!"
Namor returns to his underworld realm to find it devastated in the wake of the nerve gas contamination. Fortunately, his subjects are just in a comatose state and amphibian scientists are eager to help them. Namor takes the scientists to Dr. Hydro's island base and then seeks out Dr. Walthers who has been working on a force field device that can protect Atlantis from any other nerve gas contamination. However, the costumed villain Force stands in his way. Namor drives him off and continues his search for Dr. Walthers.