- Alpha Female T-Rex, the leader of the Adventurers' Island T-Rexes.
- Dr. Ronald "Rex" Alexander, the founder and leader of XERRD.
- Alpha Rex, the name used by mutants to refer to Dr. Rex.
- Fafnir Rex, one of five major species of Mutant Viking Monster.
- Mutant T-Rex, one of four major species of Mutant Dino.
- X-Rex, an enhanced breed of Mutant T-Rex that was exterminated by Zonic and Rip.
- Ofnir Rex, the strongest Mutant Viking Monster.
- Rex, a T-Rex actor who worked for LEGO Studios.
- Rex Alexander, an elite Dino Attack agent.
- Robo-Rex, a villainous robotic duplicate of Rex Alexander working for Cane.
- Rex Spartana, the son of Leonidas "Fullmetal" Spartana.
- The Rex, a T-2 Typhoon that was used in the final battle.
- Tyrannosaurus Rex, or T-Rex, a theropod dinosaur species found on Adventurers Dino Island and Adventurers' Island.
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Rex (Disambiguation)
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