苏联， 伟大的卫国战争如火如荼。 年轻的飞行员列昂尼德（ Леонид）和鲍里斯（Борис）到达飞行学校后，发现他们已经加入了航空兵团，并将很快被派往前线。

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...