Lilac Sphere

A book in the Alice Girl From the Future series of Kir Bulychev, and a 1987 film by Pavel Arsenov, with Natalia Guseva reprising her role as Alisa.

In 2087, Alisa along with her father Professor Seleznev and their friends Captain Green and Gromozeka the archaeologist, encounter a dead spaceship, the Black Wanderer. This ship traveled to Earth in the past and left there a purple sphere that is a weapon. It is a bomb that will explode and release a virus that will make all people hate each other and want to kill each other. The Black Wanderer was going to then come to Earth and take over the planet, but some the virus made the crew kill each other, while the bomb is still on Earth. This bomb will explode and undermine the Earth in eight hours.

Therefore, Alisa and Gromozeka must go back in time to The Age of Myth, when there really were wizards and dragons. Here, they enlist the help of the sorcerer Uuukh, and encounter many figures from Slavic Mythology, such as Baba-Yaga and Koschei the Deathless. Eventually, the heroes find the sphere, and Uuukh casts it into the sun, saving the future. Alisa and Gromozeka return to their time, and all is well.

Tropes:
 * Brick Joke: Alisa finds a toad. At the end, it turns into a princess, who ends up with Captain Green.
 * The Captain: Captain Green.
 * Cool Spaceship: The Pegasus.
 * Gentle Giant: Gromozeka.
 * Hate Plague
 * Hurl It Into the Sun
 * Magic Carpet
 * Names to Run Away From Really Fast: The Black Wanderer.
 * Sequelitis: This film was nowhere near as beloved as Guest From the Future.
 * Slavic Mythology
 * Special Effects Failure: It is easy to see the wires holding up the flying carpet.
 * The Time of Myths: 26,000 or so years ago.
 * You Look Familiar: Several actors from Guest From the Future return, but play different roles. Vyacheslav Nevinny, who played Space Pirate Jolly U in the last film, now plays Gromozeka.