故事紧接着上一集展开，可爱的母海豚温特如今已经成为了全美国家喻户晓的明星动物了，和小主人索亚（内森·甘宝 Nathan Gamble 饰）以及管理员卡梅伦博士（摩根·弗里曼 Morgan Freeman 饰）一起，温特在克里尔沃特海洋馆里安了家，时不时进行一场愉快的表演，收获观众们的赞美与掌声。 本以为曾经的风波已经远去，美好的生活即将继续，就在这个节骨眼上，美国农业部发布的一条规定令索亚一行人再度陷入了困扰之中。规定中，温特唯有找到伴侣才能够继续留在海洋馆，否则的话，它将被放回大海，回归自然。就这样，卡梅伦博士开始忙起了为温特“相亲”的事宜，哪知道这件事情真正做起来却是如此的困难。
It has been several years since young Sawyer Nelson and the dedicated team at the Clearwater Marine Hospital, headed by Dr. Clay Haskett, rescued Winter. With the help of Dr. Cameron McCarthy, who developed a unique prosthetic tail for the injured dolphin, they were able to save her life. Yet their fight is not over. Winter's surrogate mother, the very elderly dolphin Panama, has passed away, leaving Winter without the only poolmate she has ever known. However, the loss of Panama may have even greater repercussions for Winter, who, according to USDA regulations, cannot be housed alone, as dolphins' social behavior requires them to be paired with other dolphins. Time is running out to find a companion for her before the team at Clearwater loses their beloved Winter to another aquarium.
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