Dragon Ball Z Episode 104 -

Frieza immediately uses that donated energy to launch a final, desperate blast at Goku's back, forcing Goku to retaliate with a "怒りの一撃" (Angry Kamehameha), seemingly ending the fight for good.

Despite Frieza's heinous crimes, Goku shows unexpected mercy by giving the dying tyrant some of his own energy so Frieza can survive the planet's explosion. Dragon Ball Z Episode 104

Primarily covers material from Chapter 326, "The End of the Battle." Frieza immediately uses that donated energy to launch