Dragonball Comedy
Biography
Garlic Jnr. and the spice boys came to earth from the dead zone (that gohan sent him to in movie #1) with the energy from the makio star to take over Kami as guardian of the Earth but Gohan Piccolo and Krillin whent to Kamis look out and faught him and the spice boys. They killed the spice boys and then gohan sent garlic jnr. back to the dead zone (because hes the best).
The Alternative Theory
Garlic Jnr. has been obsessed with killing Kame for one reason and thats because he is Kame's illegitamate child. It all happened after Kame and Mr Popo had a night of rampant passion after getting drunk at Yamcha's birthday. When Kame found out about Garlic jnr.'s birth he discarded him. Garlic Jnr is currenly stuck in the dead zone and running a highly succesful chain of French Bakerys as well as a strangle hold on the Pot Noodle black market.