Once part of the soviet space program, Yuri was a monkey, experimentally shot into space during the 1960's cold war spacerace. Mysteriously, monitoring soviet scientists suddenly lost track of monkey Yuri's spacecraft.
Puzzled by its sudden disappearance, Soviet space-command wondered what had become of their beloved test-pet Yuri. Little did they know that Yuri's spacecraft had entered a warpfield anomaly and was transported hundreds of years into the future!
Also, the warpfields radiation boosted Yuri's mind to superintelligent levels. The new, more intelligent, mad and slightly sadistic Yuri quickly grasped the situation and modified his broken rocket into an equally mad timetraveling supercomputer jetpack.
With the jetpack translating everything Yuri says and does, enemies are never quite sure who is in control, the mad scientist monkey, or the computer it created?
Source: The Developer Website.