Ben is a plague doctor, renowned for his innovative scientific cures and methods. His success, however, sparks jealousy among others, leading to a deadly conspiracy against his family. Devastated, Ben builds a time machine, intending to save them, but discovers it can only travel to the future and back to its creation point. Realizing he can't alter the past, Ben travels to the future to acquire advanced scientific knowledge. He transforms into a deadly assassin, determined to exact revenge on those responsible for his family's demise.