Dragon Ball Kai Episode 37 - "A Tormenting Super Transformation! Freeza's One Million Fighting Power"
Piccolo arrives on Planet Namek following being resurrected and wished there. He begins rushing towards the battlefield, and along the way encounters an ailing Nail, on the brink of death. Piccolo reluctantly performs Namekian fusion with Nail, which increases his power substantially, and begins rushing back to the battlefield. Meanwhile, Frieza, after battling the Earthlings and Vegeta in his first form, transforms to his second form following some goading from Vegeta - and this increases the tyrant's power level to over a million! With his increased power, Frieza charges at Krillin in the air, impaling him on his horn.

Suppiido FanSubs:

Dragon Ball Kai Episode 37
Japanese | Subtitle: English | 0:23:25 
[Suppiido-Fansubs]_Dragon_Ball_Kai_037_[46FA19F].avi 
Genre: Anime

http://rapidshare.com/files/323847160/SF_Dragon_Ball_Kai_037.avi.001
http://rapidshare.com/files/323842959/SF_Dragon_Ball_Kai_037.avi.002