Janemba was the creation of thousands of years of processed evil from Heavens gates. A stupid Tank boy was listening to rock music while he was meant to be working, this caused all the tanks to explode in one huge explosion resulting in the creation of Janemba. At First he appeared to be a playful jolly creature, that soon changed...

Form 1

Janemba's first form was more of a warm-up then an actual fighting form. Whilst in this form all he did was bounce around and throw Goku around a bit. He was slow, bulky and not that strong, his only advantage was being able to manipulate space, as seen above.

Form 2

Now we're getting down to business, Janemba shrunk down to a compressed version of himself, he was fast, agile and very powerful. Even ssj3 Goku was overpowered by this beast, although I'm pretty sure Janemba's ability to manipulate space didn't help Goku here. Luckily along came vegeta to help Goku perform the fusion dance. Janemba was only defeated by ssj Gogeta.