Super Kaioken 3

Super Kaioken 3 is a technique where Goku uses Kaioken while transformed as a Super Saiyan 3. As even using the first Super Kaioken would kill the technique user, this as well as the first Super Kaioken could only be used while in Other World. Had Goku used Super Kaioken 3 against Fat Buu (he was dead during this time), all of his time on Earth would have ran out much faster. Had he used it against Super Buu when he was alive again, it would have damaged his muscles and given him a heart attack.

Appearance
The user appears just as they do as a Super Saiyan 3, except they glow with a reddish tint, their hair and skin also sharing the reddish tint. The aura is the same Kaioken aura as well. When using Kaio Ken x20, the users body bulks up.

About
Goku achieved Super Saiyan 3 during the time Gohan and the others were training for the martial arts tournament. As soon as he achieved it, he used Super Kaioken, going as high as Super Kaioken x20 as a test. He knew he could never use it while alive though.