After escaping from the cave and surviving the doomsday crisis, the primitive Gulu family decided to find a new home. On the way, Guy (voiced by Ryan Reynolds) has become a member of the Gulu family, but what makes Gua Ge (voiced by Nicolas Cage) headache is that Guy and his daughter Xiaoyi (voiced by Emma Stone) are always in love with each other, and they still want to form a small family that belongs to only two people. Just when the Gulu family was hungry, they found a fertile land with abundant food hidden in a high wall. It turned out that the civilized couple Hope and Phil who opened up this paradise were friends of Guy's parents who had passed away. After the initial warm hospitality, Hope and Phil, who wanted to match Guy and his daughter Xiaoxiao, found that the Gulu family had become a stumbling block. In order to snatch Guy away, they used psychological tactics. The two families were in a mess, and Guy and Xiaoyi also had a rift, but they didn't know that the danger was slowly approaching...