Aliens appear many times in the Dino Run game. There is an Alien Egg that only appears in level 5, an alien head as well as a UFO in Beyond Apocalypse. The aliens went to Earth in a UFO to save the dinosaurs from extinction and to bring them to their planet, Planet D. It has lower gravity and balloons floating everywhere. Strangely, there are no aliens seen on Planet D. The aliens were somewhat like Noah's Ark because they brought a pair of all the dinosaurs to save them. They have the Bronto egg with then in the UFO.
The aliens' heads resemble those of the Xenomorph of the Alien series.