Only one species can rule on any planet! Would you and your kind be willing to surrender--be subservient to us? 
- — Klystro
Action Comics #576 is an issue of the series Action Comics (Volume 1) with a cover date of February, 1986.
Synopsis for "Earth's Sister Planet!"
Superman seeks to stop an intelligent dinosaur from a sister-world of Earth from destroying the human race and taking over the planet.
Appearing in "Earth's Sister Planet!"
Featured Characters:
Supporting Characters:
- Lois Lane (Cameo)
Antagonists:
- Dinosaurs
- Klystro (Single appearance; dies)
- Young Creature (Unnamed) (Single appearance)
- Solarmaster (Single appearance)
- Two Guards (Unnamed) (Single appearance)
- Pterodactyls (Unnamed) (Single appearance)
- Two Hyvults (Single appearance)
Other Characters:
- Mark Hayim (astronomer) (Cameo) (Single appearance)
Locations:
- Space
- Comet (Unnamed) (Flashback only)
- The Sun (Flashback and main story)
- Pluto (Mentioned only)
- Neptune (Mentioned only)
- Jupiter (Mentioned only)
- Asteroid Belt
- Mars (Mentioned only)
- Venus (Mentioned only)
- Planet (Unnamed) (Single appearance) (Origin)
- Klystro's Heating Salon
- Weapon System (Unnamed) (Destroyed)
- Gamma Rays
- Fortress
- Dungeon
- The Moon
- Earth
- Metropolis
- Observatory (Unnamed) (unknown location)
- Galaxy Communications Building
- Metropolis
Items:
- Concentrated Power Beam
- Immobilizer (it increased the power of gravity on Superman's body by more than 10,000 times)
- Daily Planet Newspaper
Vehicles:
- Klystro's Spacecraft (Destroyed)
- Gamma Rays
Concepts:
Synopsis for "The 'Monumental' Menace of Metropolis!"
A trapped alien super-hero switches bodies with Superman in order to attempt to fight off invading aliens.
Appearing in "The 'Monumental' Menace of Metropolis!"
Featured Characters:
Supporting Characters:
- Jimmy Olsen
- Perry White (Mentioned only)
Antagonists:
- Voranians
- Bara (Flashback and main story) (Single appearance)
- Parkha (Flashback and main story) (Single appearance)
Other Characters:
- Citizens of Metropolis (Unnamed)
- Cab Driver (Unnamed) (Cameo) (Single appearance)
- Vaalor (Flashback and main story) (Single appearance)
Locations:
- Space
- Voran (Mentioned only)
- Earth
- Metropolis
- Park (Unnamed)
- Metropolis International Airport
- Hanger 2713 (Destroyed)
- Galaxy Communications Building
- Outskirts of Metropolis
- Metropolis
Items:
- Jimmy Olsen's Camera
- Daily Planet Globe (set on fire)
- Jimmy Olsen's Signal Watch (the wrist band was super-heated into a lasso)
- Voran's Weapon (Unnamed)
- Liquid Metal
- Statue of Vaalor
Vehicles:
- Taxi Cab #7134
- Ultra Sonic Airlines 747 (In ruins)
Notes
- "Editor's Note: The events depicted in this issue's stories occurred prior to the dramatic developments now appearing in Crisis on Infinite Earths."
- The Dinosaur's planet was once in the same orbit as Earth's. A comet knocked it out of orbit and the planet was turned into a giant spacecraft to keep the dinosaurs from freezing. The planet was ultimately moved into the same orbit as Venus by Superman.
See Also