The first of the time machines lands in the time of Lewis Carol and Alice and the kit is retrieved by her. Apparently her experiences with the kit are communicated to her uncle who puts it in his work Alice in Wonderland. Alice having already grown up and conditioned to the science of our world is not able to follow the 'path' of migration. However she understands that there is such a path and requests her uncle to incorporate the intricacies of the path in the song "Mimzy Were the Borogroves".
The second kit lands later and is retrieved by a very young kid Scott, who with the help of his infant sister Emma is able to grasp the 'path'. They are helped in their endeavour, by Lewis Carol's Alice in Wonderland. They succesfully emigrate to the future much to the chagrin of their parents.
Of course the movie 'Last Mimzy' bears no resembelance to the original work of Henry Kuttner. But has the chief characters Emma and Scott, their parents and a spiritual history teacher. The movie has all the great ingredients as Tibetan mandalas, US govt security agencies and even INTEL corporation of the future producing molecular level processors(the Mimzy from the future contains the processor).
The one liner of the movie is that people of the future, are in the danger of losing their humanness and send mimzies into the past. the last mimzy lands with scott who builds a power generator that causes an outage requiring NSA investigation and quaratining of the family. however the kids successfully send the mimzy back to the future with a precious tear drop of emma which helps the future people hang on and reclaim all the noble human emotions.
Do read the story and watch the movie, enjoy them both. Enjoy science fiction as a genre.