Shimatta!! Gokuu Tobikomu Wana no Hoshi!?

After seemingly securing a dragon ball, three mysterious strangers steal what the Saiyans worked so hard to attain. In their haste to track down the thieves, Goku, Pan, and Trunks find themselves tricked into touching down on a dangerous asteroid. Meanwhile the three strangers present the spoils to their bizarre leader! Just who is this mystery man...and what makes him so dangerous?