DBZK Episode 38
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Frieza Bares His Fangs! Gohan's Overwhelming Attack! (「牙をむくフリーザ！超絶パワーが悟飯を襲う」, "Freeza Bares His Fangs! Gohan's Transcendent Power Attacks") is the thirty-eighth episode of Dragon Ball Z Kai. The episode first aired on December 27, 2009. Its original American air date was October 21, 2010.
Gohan, enraged after witnessing Krillin's impalement, releases a relentless attack on Frieza. Frieza gets up and attacks and wounds Gohan. Just as Frieza is about to kill Gohan, Krillin apears and shoots a barrage of Destructo Disks at Frieza (managing to cut off the tip of his tail). Freiza, enraged about the loss of his tail, chases down Krillin giving Dende enough time to heal Gohan (much like he did to Krillin).By the time Krillin arrives a the area that Gohan and Vegeta are at, Frieza is already there. Just as Gohan is about to attack Frieza, Piccolo (newly fused with Nail) arrives. Can Piccolo take this new deadly foe?