Negative Frieza is Frieza's form after he absorbs all the negative energy in the galaxy. He used this form to break out of Hell, but was not planning on Goku being a Super Saiyan 2, and he was quickly sent back after being defeated. He tries this every 20 years, even though he knows that someone is going to put him back in Hell. He has negative spots all over his body from all the negative energy, but gains immense power from it.
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