The Z fighters are doing normal things on this day such as training and hanging out but then they all sense a Ki signature heading towards earth, when they go to they site where the Ki is they find a saiyan pod with a teenager in it who seems to be a saiyan

Goku: Who is this kid? Gohan: I don’t know… Vegeta: This better not be another plot of that damned Freiza! Piccolo: ….. Beerus: Whis, who is this mortal? Whis: I’m unsure my lord. But he is a saiyan.