This paper is a hypothetical investigation with tongue firmly in cheek - prompted by the discovery of a plastic collectible Toy Story Alien toy depicted wearing anaglyph glasses. The Toy Story Alien has three eyes and was first introduced in the 1995 Pixar movie Toy Story. Would it be possible for three-eyed aliens to see in 3D using red-cyan anaglyph glasses? Probably not, for reasons described in the presentation, but a possible solution is provided. There are real-world examples of anaglyph glasses being fitted to Praying Mantis and Cuttle Fish to investigate 3D vision, so why not aliens? The presentation also discusses options for other types of three-lens 3D glasses such as passive polarised and active 3D glasses. Are there any useful insights from this investigation? Its an interesting thought experiment, so well let you decide!