A young boy and his father, both lovers of martial arts make an initiatory journey to China. During one of their ritual exercises, they accidentally plunge into a lake with mysterious properties. Following this forced swimming, some upheavals will occur in their body structures. From now on, in contact with hot water, or cold water, the father transforms into Panda, and his son into a young girl. From then on a whole suite of quiproquos and imaginative adventures never cease to arrive to them...