The evil wizard Walator has targeted Goudall with a curse that stripped him of his magical power and scattered it across twenty underground caves, sealed inside diamonds that are now hidden throughout Walator's subterranean kingdom. Goudall needs every one of those diamonds back to recover the power necessary to defeat Walator. The underground is dense with Walator's creatures, traps, and environmental hazards — bats, serpents, rivers of lava, poisonous plants, and enormous monsters. Goudall cannot attack — his power is gone. He can only run and jump. With precise movement and good timing, that is going to have to be enough.