When Goku's spaceship is entering the orbit of a star, he has to fire an energy attack to repel him away from the star. However, FUNimation made him use the Kaioken, when it's obvious that he uses the Kamehameha (That's what he did in the Japanese version). And before you say the he was using Kaioken on a Kamehameha he had been already doing, he never said "Kamehameha!" to charge up the blast! Pretty dumb mistake, even for FUNimation.