Belka, the amazing flying dog is unexpectedly hurdled into the streets of Moscow when the rocket she is in malfunctions during one of her circus routines. Fortunately the crash leads her to meet a streetwise dog named Strelka and her irredeemable rat friend Venya. Together with other amusing friends found along the way, the three find themselves in a space program-training center where they get sent away in a rocket, leaving planet Earth...