In the beginning of this saga, Goku participates in the Other World Tournament, a tournament being held in honor of King Kai. The winner will receive a private lesson from the Grand Kai himself. An incredible array of awesome fighters participate, but it all boils down to the final match between Goku and Pikkon.
Neither Pikkon nor Goku have revealed their true power yet. Pikkon takes off his weighted clothing used for training. Goku turns Super Saiyan. The crowds watch in amazement as the tournament progresses. Pikkon has great speed. Goku unleashes the Kamehameha. Pikkon responds with a Hyper Tornado Attack. Then Goku throws a Kaio Ken followed by another Kamehameha. Pikkon does a Thunder Flash. Pikkon is out of the ring!!! Goku is declared winner!!!

But both Goku and Pikkon have broken a rule. Both are disqualified. They touched the ceiling of the stadium. Both fought well and are told they will receive personalized training in 200-300 years.

Mysterious Gohan Attending Orange Star High School, playing baseball and discovering girls, Gohan appears to be a normal teenager, except for one important difference...he is the Great Saiyaman. Not wishing to bring attention to himself and his family, Gohan dons a disguise with a touch of a button before performing heroic acts like saving an airplane full of people. He pushes a button on his Transformation Band, which looks like a watch, to change into his Great Saiyaman disguise.

But all are not content to let the Great Saiyaman keep his identity a secret. Among others, Hercule�s daughter Videl wishes to unmask the Great Saiyaman. As the daughter of the famous Hercule and an awesome fighter in her own right, she is often called by the police to help protect the peace. Thus she often runs into the Great Saiyaman as he too is often helping out in time of crisis.

Videl discovers the Great Saiyaman�s identity and threatens to tell the others if he does not participate in the upcoming World Martial Arts Tournament. Her father Hercule won the last championship. Gohan�s father Goku had also won previously. Videl wants the son and daughter of two previous world championships to compete.

Reluctantly Gohan agrees and alters the disguise of the Great Saiyaman so that he can compete. No armor of any kind is allowed so Gohan replaces his helmet with a scarf and sunglasses.

Gohan and Videl are not the only participants. The promise of prize money to the winners and the challenge of battling against the great fighters of the world attracts many of the Z fighters including Goku (who gets a leave to come back from the Other World to participate in the tournament), Krillin along with his wife Android 18, Vegeta, Piccolo, even Goten and Trunks, and the last World Champion Hercule.