The following images are of the Tyrannosaurus rex, or T-rex, animals present in the Heaven's Disciples Universe, on the Tierra's (or Earth's) Atlantica Islands and in the Atlantica System worlds. One image is of an adult male T-rex and the other is a feathered juvenile T-rex.

According to Atlantican lore, before the Great Flood, God's angels created the stellargates, or Ark gates, on the Atlantica Islands to teleport prehistoric and modern animals onto the Atlantican planets that they terraformed in the Atlantica System. The planets that were terraformed were the worlds that orbit the Atlantica Sun from within the Atlantica Asteroid Belt, now belonging to the Atlantica Federation.

The Atlantica Federation created bioreserves to contain all primeval animals, including dinosaurs, on all Federation worlds.