Russian animated children's feature loosely based on space dogs Belka and Strelka, who orbited the globe in 1960 before safely returning to Earth. After escaping from the local pound, Strelka, a homeless stray, teams up with Belka, canine canonball of the local state circus, when her trajectory takes an unexpected path. Along with a motley collection of streetwise local strays, the pair find themselves caught and transferred to a secret space laboratory where, after some intensive training, they learn they've been selected for a space flight mission.