Deep down in the earth lies a world of fantasy and sci-fi technology only thought in children's imaginations and books. The 99 Caverns, a action packed society where the ammo is alive—there's no room for boredom when the slingers start slinging.

A new slinger rolls into town....but are they friend, or foe? Will the Shane Gang meet a new friend, or will they have to slug it out against a new enemy?