Bonk's Adventure is a 2D platform video game developed by Red Company and Atlus and released in 1990 for the TurboGrafx-16. In Japan it was known as PC Genjin, a play on the Japanese name for the system, 'PC Engine'. The game was later ported to the NES, Game Boy, Amiga, arcade systems under different titles (FC Genjin, GB Genjin and BC Genjin) and is available through Nintendo's Virtual Console service and on the Japanese PlayStation Store.
The game's protagonist is Bonk, a strong caveboy who battles anthropomorphic dinosaurs and other prehistoric themed enemies. Bonk's mission is to rescue Princess Za (a small pink Pleisiosaur-type reptile) who has been kidnapped by the evil King Drool (a large, green, Tyrannosaurus-type dinosaur). In the Arcade version, Bonk is also assisted by a female version of himself.
Source: Wikipedia, Bonk's Adventure , available under the CC-BY-SA License.