Gohan is the Goku and Chi-Chi's first child. He is half saiyan, which makes him a perfect weapon. When Saiyan power and human emotion mix, it makes a highly deadly power, which Gohan posesses, but has no control over. He uses this power many times, first against Garlic Jr, in the movie Dead Zone, then against Radditz, Nappa, Vegeta, Frieza, and so forth. He learns to control this power when fighting Cell in the Cell Games. Afterwards, he is very strong, but growing up and going to school takes time from his training, and he slips from being the World's strongest, to a novice fighter.