Dragonball Z: Return of Dr. Gero is a Dragonball Z movie released on December 27 2009. It was released on dvd and blu ray on April 5th 2010. The movie is set in between the defeat of Kid Buu and the first episode of Dragonball GT.
In H.F.I.L. there is a prison for evil souls that are too dangerous to be left lurking about H.F.I.L. and in the prison there are six prison cells. In one cell there is the evil android Cell, in another cell there is Frieza, in another cell is Nappa, in another there is Captain Ginyu, in the next cell there is Babidi and in the last cell there is the evil Dr. Gero! One day they all decide to escape. They dig underground. They all meet up underground and they keep digging but then they accidentally end up in King Yenma's office. King Yenma captures Frieza, Cell, Nappa, Captain Ginyu, and Babidi but then Dr. Gero escapes to the planet Earth. He is back in his old lab. He knows that if he went around in any city people would recognize him as the evil Dr. Gero, so in his lab he creates a new body for himself. One that will hide his true form from his enemies. To hide the form of Dr. Gero! more to be added