Dragon Ball: Ossu! Kaette Kita Son Goku to Nakama-tachi!!

Based on an original concept by the original author Akira Toriyama, the story, set shortly after the defeat of Majin Buu, pits Son Goku and his friends against a new, powerful enemy.

This special introduces four new characters: Abo and Kado red and blue aliens wearing battle fatigues similar to Frieza's army, one tiny yellow alien, and a young Saiyan child who vaguely resembles Vegeta named Tāburu. Though very little about the plot has been revealed, Table has arrived on Earth, being pursued by Avo and Cado.

(Source: Wikipedia)