(Based On The Movie Killdozer From 1974) A meteorite crashes onto the Earth's surface on an island off the coast of Africa. Years later, after natural forces have buried it and restored the local environment, six construction workers are boated to the island to begin work building an airstrip for an oil drilling company at the crash site on the uninhabited island. A recovering alcoholic, foreman Kelly, is in charge, but this is his last chance to redeem himself; if he fails this project, he will almost certainly be fired and face abysmal job prospects.
Kelly and bulldozer driver Mack uncover the meteorite, which emits a strange sound. When the bulldozer is used to try to shift the meteorite, it emits a blue light that moves to, and seems to possess, the bulldozer. Mack, standing nearby as this occurs, falls ill and then dies some hours later. Chub, the team's mechanic, cannot find anything wrong with the inoperative bulldozer, but can hear the odd sound from the blade. Kelly orders that the bulldozer not be used.
Beltran ignores the prohibition and starts the bulldozer, bringing it to malevolent life, indwelt by the entity. It destroys the camp's radio and begins a rampage, killing the workers one by one. It seems to run indefinitely despite a limited fuel capacity. The entity that indwells the machine has some rudimentary intelligence and guile: it hunts down the men.
The crew is soon reduced to just Kelly and Dennis. Running out of options, with the expected relief crew not due to arrive just yet, they amuse themselves by convicting the entity/bulldozer of murder, then consider methods of "execution": it is too heavy to hang, and too big for the gas chamber. They then realize electrocution may be possible. They lure it to a trap consisting of steel Marston Matting connected to a generator.
As the high voltage electricity conducts through the bulldozer, the alien entity emerges as an aura around the machine. Still, there is nothing close by for it to transfer to: the aura finally fades. The men shut down the power and checked the blade: no sound. Though Kelly realizes his story will not be believed, he intends to tell the truth.
