Vreen, also known as Robugs, are a race of aliens. They are aliens/robots that have an insect-like appearance that live in the planet Sectoid.
Vreen are shaped as huge humanoid-like grasshoppers, they're synthetic beings despite their organic look. Each Vreen have two pairs of wings, which can be spread and rotated as the blades of an helicopter. Vreen's left arm have a extendable tendril while the right arm has a laser blaster.
When in attack mode Vreen's head colapses into its torso, making the orb in the cavity of its chest temporary eye.