DragonBall Z: Two Enimies are stronger than one.

DragonBall Z: Two Enimes are stronger than one

Proluge
This takes place in an alternate timeline for dragonball Z, where the the events of the android saga was delayed seven years. So those several years were peaceful. Goku had taught Gohan super saiyan, but the two never went pass that due to not training in the hyperbolic time training. Vegeta, through is heated rivalry with Goku, became an ascended Super Saiyan. Then the heart attack kicked in. Gohan had gave Goku the medicne Future Trunks had supplied him with several years ago.