Mechani-Kong was both designed and built by the international criminal, Dr. Who, to mine the radioactive Element X from the Arctic underground, but the robotic ape failed his creator, the radiation of Element X damaging his controls. However, Dr. Who came up with another plan to abduct the real King Kong and using Mechani-Kong, hypnotize Kong to mine Element X instead. However, the combination of Kong’s mind and the cries of Nurse Susan Watson, who Kong had a liking for, were able to overcome the hypnotism and Kong escaped to Tokyo, with both Mechani-Kong and Dr. Who in hot pursuit.
In Tokyo, King Kong and Mechani-Kong battled up the side of Tokyo Tower, both monsters getting their shots in on one another. In the end, an attack back on Dr. Who's ship crippled Mechani-Kong's controls and turned the tide of battle in Kong's favor. The crippled Mechani-Kong then fell from the tower, crashing into the street below and shattering into several pieces.
Hypnotic light emitted from head
Grenades on waist
High Beam eyes
Mechani-Kong, as he originally appeared in Rankin Bass' "The King Kong Show", aired in 1966
According to Koichi Kawakita in the Godzilla Birth Festival 2010 on November in the Ginza district of Tokyo, Japan, Mechani-Kong was supposed to appear in a scrapped "Godzilla vs. Mechani-Kong" film in the Heisei series.