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An Extra-Terrestrial Life-Form.
- If the aliens are not intelligent (meaning that they do not think as much as humans), then they should be attacking the protagonists for survival. For example, in Pitch Black, they simply need to eat.
- If the aliens are intelligent, then they should be attacking the protagonists for honour, revenge, or something else that is not based on basic survival, with the Precurors in Pacific Rim being an example.
- Like in Guardians of the Galaxy, make most of the ensemble humanoid.
Types of Aliens
- Humanoids - These are intelligent creatures which have a similar form to humans.
- Insectoids - These are creatures that share qualities with insects.