Two years have passed since the battle with Majin Boo. Mr. Satan's hotel, built as a commemoration of the victory over Boo, is finally complete!!

Gokuu and the other fighters are invited as guests. While Gokuu and the others are enjoying the party, a strange pod falls to Earth. Inside, a sharp-eyed Saiyan detects strong fighting abilities and takes a small alien along to the party! When the Saiyan encounters Vegeta, his words shock everyone!!

Source: http://www.jumpland.com/animetour/db/index_en.html

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Parent story: Dragon Ball Z