He continues to train Trunks, but Trunks still cannot reach Super Saiyan level. Days go by, and the androids are still a menace in endangering the Earth. Gohan and Trunks decide to face the androids again. Trunks feels ready to go, but Gohan hits him behind his neck and knocks him out. Gohan knows that Trunks is still not ready, and goes to fight Androids 17 and 18 himself.
Trunks awakens and discovered what has happened.
He quickly flies over to the city the Androids were in. There is a storm. Rain is falling hard. Trunks looks at the dead Gohan and becomes enraged. He screams and finally reaches Super Saiyan level.