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.

根据季尔·布雷乔夫的小说《凶险的紫球》改编，为阿丽萨历险记系列作品之一，译名部分参考了王志冲先生的译著。该电影由《来自未来的客人》导演执导，主演娜塔莎·古谢娃仍扮演阿丽萨·谢列兹涅娃。电影讲述的是在太空旅行的女孩阿丽萨意外发现地球面临着危险。2.6万年前入侵者曾在地球上埋下了能够使人变得仇恨的紫球，这颗定时炸弹即将引爆。为了人类的安危，阿丽萨毅然乘坐时间机器，赶往童话时代追踪入侵者，毁掉包含仇恨的紫球...