Dragon Fist Assault!

A boy with pointed ears and a sword is shown fighting a giant monster. He is defeated. The movie switches to present time. Gohan and Videl fight crime. After they capture some robbers they go back to class. Gohan receives a message and he and Videl head out. An old man is trying to commit suicide, but is rescued by Gohan. He presents them a box and asks if they can open it. Neither Gohan or Videl can. They take it home and even Goku can't open it. They gather the Dragonballs and wish the box would open. It opens and a tall man with a sword and ocarina comes out. He says they've made a big mistake by letting him out. He runs off to a nearby warehouse.

Trunks and Goten go into the warehouse, but are told to leave by the man, Tapion. At a cookout, trunks give him some food. Trunks brings him meals and thinks of him as the brother he never had, but is rejected. The next day a monster Hildegram reeks havoc on the city. It's only the legs of a monster though... Not even Gohan can stop it. Tapion appears and plays his Ocarina trapping it in him.

While Tapion is sleeping his Ocarina falls. He is attacked by the top half of a monster, but is able to grab his Ocarina. The old man who wanted to open the box Tapion was inside shows up. He tries to take the Ocarina, but Trunks shows up and grabs it. Tapion and the old man try to persuade Trunks, but Trunks yells, "Bother catch!," and throws it to Tapion. The old man escapes and Trunks is about to leave, but Tapion asks if Trunks will eat with him. Trunks takes Tapion home the next day and shows him all his toys. Tapion puts Trunks to bed that night and is going to head back. Bulma says Tapion is welcome there, but he says he endangers them. He explains that on his planet, wise men summoned a monster called Hildegram from a statue. The monster reeked havoc on his planet, but it was stunned by Tapion and his brother playing their ocarinas. The monster was cut in half and each half was sealed inside of Tapion and his brother. For precautions, Tapion and his brother were each sealed in a magic box and sent off across space. Hildegrams legs were released meaning his brother was probably dead. Bulma says she'll make Tapion a box so that he can sleep without the full monster sealed inside him, escaping.

The next day Bulma finishes the box and Tapion goes to sleep in it. Somehow the monster escapes and continues to destroy the city. Tapion tries to seal it up in him, but it's too strong. Goku and Goten go Super Saiya-jin and attack. Gohan also attacks. They are all defeated. Vegeta awakens and is pissed off he is also defeated, but he manages to save some humans. Goten and Trunks fuse into Gotenks and go SSJ3, but they still cannot beat the monster. Tapion finally seals the monster and gives Trunks his sword. He tells Trunks to kill him. Trunks hesitates, but he knows he has to. He is too late, the monster escapes.

Goku knows the Earth is in trouble and goes SSJ3. Trunks uses Tapion's sword and tries to help, but Goku wants to fight alone. Goku uses his new technique called the Dragonfist and his arm turns into a dragon and goes right through Hildegrams giant body killing him.

Bulma makes a machine for Tapion to go home. Trunks is sad so Tapion gives Trunks his sword. Tapion leaves the Earth and the monster is gone.