Appearing in "Fire"
- Brotherhood of the Shield (Main story and flashback)
- Night Machine (Nikola Tesla)
- Original Life-Model Decoy (First appearance chronologically) (Only in flashback)
- Galileo Galilei (Referenced) (Deceased)
- God (Yahweh) (Referenced)
- Star Child
Races and Species:
- Humans (Main story and flashback)
- LMDs (First appearance chronologically) (Only in flashback)
- Human-Deviant Hybrids
- Marvel Universe (Main story and flashback)
- "The End of the Road" (Mentioned)
- Leonardo da Vinci's Armor (Main story and flashback)
- High Council of the Shield's Armor
- Elixir of Life (Only in flashback)
Synopsis for "Fire"
- Synopsis not yet written
The battle between Leonardo Da Vinci and Issac Newton for the Immortal City comes to a climactic conclusion! Leonid makes his choice between his two fathers, Michelangelo and Tesla kick their plan into high gear and Howard Stark lays the foundation for the organization you know as S.H.I.E.L.D.
A flashback in this story affects the chronology of the following characters: