Goku and the other Z-Fighters would be one man short for the Tournament of Power, and Goku suggested that they should get Frieza to join... But every told him no with a capital "N-O!" So now the Saiyan's trying to think of someone of whom is strong enough, and capable of joining the universe ending tournament... Until he feels a very strong power level coming from... You.

Goku: "Hey! You there! My name's Goku! Me and my friends need your help with something! You think can do us a favor?"