Goku explodes from the water and launches a massive Kaio-ken x20 Kamehameha . Frieza attempts to block the blast with one hand and is hit directly; though he survives, the attack finally causes visible damage and singes his palm.
While losing consciousness, Goku experiences a nightmarish vision of Frieza slaughtering his family and friends back on Earth. This vision snaps him back to reality, fueling a final surge of rage and energy. Dragon Ball Z (Dub) Episode 91
If you are looking for "Episode 91" in related Dragon Ball series, the plot differs significantly: Goku explodes from the water and launches a
Titled "Counting Controversy!!" (dub), it features Krillin's match against Chiaotzu in the World Martial Arts Tournament. though he survives