Dragon Ball Episode 99: Enlightenment?
Episode 99 of 153 of Dragon Ball, aired February 3, 1988, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Goku and Tien's power and technique seem to be amazingly equal, but a dramatic turn of events enrages Tien to a new level of focus and determination. Only one outcome will satisfy the proud Tien as he unveils a sinister new attack! How can Goku survive against this monstrous new Tien?