• King Rex is one of two Dinosaur-type monsters owned by Yugi, another being "Mammoth Graveyard".
  • King Rex's roar in his battle against Daimon is the roar of Zambolar, a monster which appeared in Ultraman episode 32, when being sucked by the quicksand from Golgotha's Punishment, his last words are the roar of Giradorus, from Ultraseven episode 20, and Gyango, from Ultraman episode 11

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