Fusions
Gogeta is the fusion of Vegeta and Goku.  They used the fusion dance for this and created Gogeta!
Gogeta was first seen in movie 12. Ssj3 Goku was unable to beat the evil entity Janemba, and neither was Vegeta. They were forced to fuse, the first time they got it wrong and ended up with a fat version of Gogeta, but the second time they did it right and formed the perfect Gogeta. He easily defeated Janemba. The next time we see Gogeta is against Evil Shenlong in GT. Gogeta goes ssj4 also. When he goes ssj4 his hair goes red, and his eyes red also. I think he gets a little fur on him also. Gogeta also isn't as strong as Vegetto is. Vegetto is a perfect fusion were neither warrior had to be at or near the same power level (because of the earrings). When forming Gogeta, Goku and Vegeta had to be at the same Power level. That meant Goku had to lower his to match Vegeta. That would result in a less powerful (but still extremely strong) fighter.
Gotenks is the fusion of Goten and Trunks.  They used the fusion dance for this and created Gotenks.  His most powerful stage was Super Saiyan 3.
Vegetto wasn't really a person seen a lot!  I think he was only in movies.  This is the fusion of Goku and Vegeta with the kaioshin earrings on.  Vegetto was absorbed by Buu.  Vegeta then took his earring off, and crushed it.  Goku did the same.  That was basically the end of Vegetto!



Gogeta is a lot weaker than Vegetto because when performing the Fusion Dance (with out the earrings) the 2 people have to be about the same power level so Goku lowered his power level down to match Vegeta's which makes this a bit weaker fighter (yet still a good one). Yet Vegetto when u have the earrings you don't have to be at the same power level which makes Vegetto a lot stronger than Gogeta.

                                                                       The Fusion Dance
The two fighters must be similar in size, build, and power (especially  power; they have to be almost exactly the same, but this isn't a major problem, since most of the warriors can control their power levels, so the stronger fighter just needs to lower his/her power to match that of the weaker).

The dance must be performed correctly for a successful fusion. Any minor mistake in the dance can result in a defective fusion.

The fusion will last for 30 minutes, by which time both fighters will return to their normal selves, but there doesn't appear to be a way to end a fusion before this 30 minute time limit.

After a fusion ends, the two fighters must have a waiting/resting time of one hour before the fusion dance can be performed again.
                                                                The Kaioshin Earrings
Must have set of Kaioshin earrings.

Need to wear on opposing ears.

The fusion stays that way until earrings are taken off.

Also heard, when Vegetto was absorbed by Buu it affected the power of the earrings and Goku and Vegeta unfused.
.  "The fusion Dance is called Fusion-Waza. The Kaioshin earrings are created by Dai (master) Kaioshin, but they are not called that. They are called the Potara Earrings."
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