Adapted from a novel from sci-fi series by Kyr Bulychev about a little girl Alice. It's Alice's birthday and as a present she is invited by an old alien friend archaeologist Gromozeka to join him on an expedition to an alien planet Coleida which population was destroyed by a space plague a hundred years ago. Arriving at the planet they decide that Alice, using a time-traveling device, will go back in time to the day when the plague was brought in by their space expedition to try and save the planet from destruction by spraying the astronauts with a vaccine. To achieve that, she and another alien scientist professor Rrrr, who looks just like a cat, must make a long and perilous journey to the planet's spaceport.

6-grader Kolya Gerasimov discovers a time machine in a basement of an old house in Moscow and gets transferred into the 21st century. There he is allowed to look around. Accidentally, Kolya witnesses two space pirates who arrive from Saturn and later try to steal a device called a "Mielophone" (which can read thoughts) from Alisa Seleznyova - a girl that performs experiments with this device and animals. Kolya manages to save the device from the pirates and brings it back to the 20th century. But both pirates and Alisa get there too. Alisa knows where Kolya studies but doesn't know what he looks like. Pirates saw Kolya, but don't know anything about him. Written by Boris Shafir