Dragon Ball super. 22, The ultimate teacher and pupil

Piccolo sneaks into the Red Ribbon Army's secret base and learns of their plan to try and conquer the world again. This time, they have Dr. Hedo ... a naive super genius and grandson of Dr. Gero--on their side, and have deceived him into helping them build androids. One of these androids is Cell Max, a giant, even-more-destructive version of the original Cell. They've also managed to convince the gullible scientist that they are the good guys try...