After Captain Ginyu's defeat they have to look for the dragon balls to wish Gohan back to life. They are scattered across the world. Goku, Goku Jr., Vegeta, and Trunks go on a quest to find the dragonballs. They travel to a foreign country. They have heard that an evil monster called Lord Moo has a dragonball somewhere in his lair. So they go find him. They see the evil monster lord Moo. He bears an uncanny resemblance to Frieza in his fourth form. They are from the same race.
"What do you want?" asks Moo.
"We need your dragonball." says Goku.
"Oh I don't think so." says Moo.
"How about me and my friends take you on and whoever wins gets the dragonball!" says Goku.
"Okay! Sounds like a plan to me!" says Moo. Goku, Goku Jr., Vegeta, and Trunks all take on Moo. Moo defeats everyone except Goku. Goku goes Super Saiyan 5 and beats Moo with a Kamehameha. Moo has lost the fight. "Alright you get the dragon ball!" says Moo.
Goku turns back into his normal form. He receives the dragon ball from Moo. "Are you related to Frieza?" asks Goku.
"Yes. I am his great great great grandson. Don't worry I don't have any plans of universal domination like my ancestor." says Moo. "But I have plans of killing you here and now!"
Moo gets his head blasted off by Goku Jr. as soon as he even tries. Then they search for the six other dragon balls scattered across the world. More to be added.