Quick recap
Frieza survived, rebuilt with machine parts, and lands on Earth with his father, King Cold, to take revenge on Goku. Before anyone can react, an unknown young man with a sword turns Super Saiyan and slices them both to pieces. Goku lands soon after, and the youth tells only him that he's come from twenty years in the future. In three years, two androids built by Dr. Gero will kill almost everyone, and Goku will die before that from a heart disease. He hands over a medicine and confesses he's Trunks, son of Vegeta and Bulma. The young man returns to the future, and the fighters start training for the androids.
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