|Native Timezone||2020 - 2035|
|Related Characters|| Red Alien|
Green Alien appears only in the original TimeSplitters and is a generic type of Alien living on Planet X in the early 21st century. Their faces are flat and they have four rounded, yellow eyes. Their head is attached to a long neck, leading to their spindly torso.
|Unlock||Complete Planet X on Easy in 01:00.0|
|Gesture||Acts startled, then growls at the player.|
The Green Alien appears in the first game in his first and last appearance in the TimeSplitters Series. They appear as generic enemies during Story Missions, as well as out of Story as a duck hunter, alongside Red Alien.
- Main article: Planet X (Story)
These inhabitants of Planet X, alongside the Red Aliens and Pillar Aliens stole a cyberbrain. Troopers Sebastian Photon and Angel Perez were deployed on their mission to recover it and to get to the extraction point.
- Main article: Spaceways (Story)
After the events of Planet X, not all of the Green Aliens were killed, nor all the Red Aliens or Pillar Aliens. Due to the lack of meaning for the Spaceways Mission in the game, it appears they are just another set of characters that are shooting without motivation.