Mr. Satan has just finished building a grand hotel, and has invited Goku and his friends to a feast to celebrate. All is peaceful until Vegeta's brother Tarble shows up; he is looking for help against two evil brothers who attacked his planet, and have now followed him to Earth. Everyone wants in on the action, but in order to be fair, they decide that only two people will fight these evil brothers. After drawing lots, they determine that the mighty warriors who will confront the villains will be... the children, Trunks and Goten! Will these mighty fiends be able to defeat two small boys? Will Mr. Satan's glorious new hotel survive the onslaught? And most importantly, will Goku ever stop eating?
I wouldn't recommend this even to people who like Dragon Ball. Just reread Dragon Ball instead. The new characters--Vegeta's brother Tarble and feir wife Gure and the villains Avo and Cado--aren't interesting characters. Honestly, the story would've been more interesting if they had shown Tarble struggling on feir own without asking for help and having to find a way to overcome opponents much stronger and better suited to fighting than femself. But having the usual crew fight and easily defeat them serves no purpose and makes for a pointless plot. It's basically just showing how far Goku and the others have powered up over the years, to the point that now opponents who are as strong as Frieza pose no challenge to them, but that's not a premise worth building a story around.