Gohan became a Majin after he saw the gap in power he had after years of not training, so he asked Babidi to turn
him into a Majin. Babidi was scared so he accepted and he turned Gohan into a Majin. Gohan's power level raised by 15,000,000 and he became slightly evil. In this form Gohan defeated Super Buu W/ Piccolo absorbed. Although he had a hard time so he turned into a SSJ7 because of the desperation.