Frieza was a threat in the universe. Especially for saiyans. Frieza was the lord of many planets he reign over. He beat many kinds of people and killed them all. Except for one. A saiyan named Goku. They both met on Planet Namek and fought till the end. Goku, being the one who bested Frieza, didn't kill him. He gave him mercy and walked away. Goku told him to change his ways and that he ended up giving his energy to Frieza. Frieza is now thinking of what he should decide on. A new beginning or his old evil ways.