Big Man is hired by the manager of Sfnix, a leader business on technological armaments, to track down the criminals who stole the prototype of the the U.S.R., a new radiation beam rifle. The thieves were not able to steal the lethal weapon's computerized tracking system and are now threatening Sfinix with a massacre in order to get it. Feeling that the theft had been planed with the complicity of an employee of the Sfinix, Big Man, together with his good assistant Simon, investigates.