大头儿子和小头爸爸父子俩在奇妙的微观世界经历重重冒险，并和围裙妈妈一起战胜了邪恶势力，一家人终于明白：在孩子成长的过程中，“抓紧”是爱，“放手”也是爱。Datou the “Big-head Son” and Xiaotou the “Small-head Dad” encounter numerous adventures in the marvelous microworld, and together with Apron Mom, they defeat evil force. Through these experiences, the family finally understands that in the process of a child's growth, 'holding on tight' is love, but 'letting go' is also love.