When Woody and Buzz jump inside the claw game, they are greeted by the three-eyed aliens. One of them gets captured by Andy's neighbor Sid. When Woody saves his pal Buzz Lightyear from being grabbed, the aliens stopped him from fighting the claw. One of them gets attacked by Sid's dog Scud. During the plan, the one attacked by Scud scares Sid.
Toy Story 2
Despite being major characters in the film, the three Little Green Men first appear at the climax of the film. They appear as car ornaments in the Pizza Planet Truck. At first, Mr. Potato Head is jealous of them when he, Buzz, Slinky Dog, Hamm, and Rex first meet them while chasing Woody. But then they decide to help them save Woody. At the end of the film, the Aliens later become Andy's toys.
Toy Story 3
This time, the aliens have a bigger role than the first two films. They were seen in use by Andy until they are donated to Sunnyside Daycare. They all got captured by Lotso's henchmen. The Little Green Men tried to get to the claw, but they get ran over by a truck explained by the Chatter Telephone. They rescue the toys from being incinerated with a crane claw. They return to Andy, who gives them to Bonnie.
Buzz Lightyear of Star Command
The Little Green Men make appearances as one of Buzz Lightyear's supporters.
The aliens are going to join Woody and the gang on the road trip in Toy Story 4, despite appearing in all of the trailers and posters. But they stay in Bonnie's house as minor character and only appear at the beginning and the end of the movie.