This one? Ostensibly the sequel to the earlier Broly: The Legendary Super Saiyan, this tenth movie of DBZ is the first to take part in the Buu saga, featuring the cast of that era. All one needs to do to summon the Dragon is ask Shenlong to come out, and that's what Goten did. You act like Vegeta and Picollo have Instant Transmission 3. Vegeta was halfaway around the world.
nest...