Just before Frieza and his army are disintegrated by Earths blast!..he casts a spell!
Freiza: By the darkness of infinite space! From all the souls I cast into thee. The Evil from every heart! Bestow it into your essence! I sacrifice my soul! To release you from your Pain! To pay back All! For All your undeserved torment! From eon to eon! Never did you stretch! My son! You are FREE!