|“||The Trilopods arrive, and no monster is safe! As the Cryog Emperor unleashes an all-out assault on the planet, Lucy and Woods face their own dangers and their only hope for the future may lie in the monsters from the past.||„|
|SPOILER WARNING: This section may contain major plot and/or ending details. Proceed at your own discretion.|
(To be added)
- King Caesar (Picture cameo)
- Kumonga (Cover A)
- Zilla (Cover A)
- MechaGodzilla (Copyright Icon)
- Megaguirus (Copyright Icon)
- M.O.G.U.E.R.A. (Copyright Icon)
- Mothra (Copyright Icon)
- Steven Woods
- Lucy Caprell
- Minette and Mallory
- Jason Ford
- Monster Islands
- Los Angeles
- The copyright icons of MechaGodzilla, Megaguirus, M.O.G.U.E.R.A., and Mothra are included at the beginning of the issue, even though none of these monsters appear in the actual issue or any of its covers.
- Rulers of Earth #21 cover by Matt Frank on DeviantART.
- Rulers of Earth #21 cover by Jeff Zornow on DeviantART
- Rulers of Earth #21 on comiXology
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