Dragon Ball Z S09 E12 Majin-Buu Transforms

"The Saiyans have returned..."

Majin Buu reappears, ready for battle, but rather than continue his fight against Gohan, Buu stages a clever deception to absorb Gotenks and Piccolo. With the wisdom of Piccolo and the power of Super Saiyan Gotenks, Buu transforms into “Super Buu!”