Critics diverged regarding the scientific validity of the film. Reviewer Susan Granger said, "There's some validity to the challenging science depicted in the film, according to Brian Greene, Columbia University physics professor, and Susan Smalley, UCLA neurobehavioral genetics professor." By contrast, Rick Norwood (The SF Site) writes, "The Last Mimzy has carefully expunged all of the ideas from the story, and replaced them with the New Age nonsense that passes for ideas these days. They have also taken a very personal story about one family and a box of toys from the future and turned it into an epic story in which childlike innocence saves the human race".