布莱斯一家住在一个小农场，有时还收养孩子，是一个温暖、吵闹的大家庭。现在总统已经和他们住在一起了。但是，虽然他看起来很高兴，乐于助人，但他从来不说一句话。然后有一天，一个自称是他亲戚的人开了门。这个身材矮小、声音响亮的陌生人背着一个背包，走路时趾高气扬，名叫Sputnik。当总统在门阶上犹豫不决时，斯普特尼克从他身边走过，向家里的每个人做了自我介绍。总统对这种反应感到惊讶。一家人拍拍Sputnik的头，称它为好孩子，还往它嘴里扔食物。他们似乎都认为斯普特尼克是条狗。只有总统不这么想。 But Prez soon finds himself having to defend the family from the chaos and danger unleashed by Sputnik, as household items come to life - like a TV remote that fast-forwards people: 'Anyone can do it, it's just that people don't read the instructions properly'; and a toy lightsaber that entertains guests at a children's party, until one of them is nearly decapitated by it - and Prez is going to have to use his voice to explain himself. It turns out that Sputnik is writing a guidebook to Earth called Ten Things Worth Doing on Earth , and he takes Prez on a journey to discover just those ten things. Each adventure seems to take Prez nearer to the heart of the family he is being fostered by. But they also take him closer to the day that he is due to leave them forever . . .