Earthbound, also known as Mother in Japan is the first game in the Mother/Earthbound series. Nintendo of America had fully translated this game, and even made improvements upon the Japanese version when they cancelled it. The SNES was just about to be released and NOA's marketing department decided against releasing this one.
Earthbound on the SNES, or Mother 2 in Japan is actually the sequel. Any fan of Earthbound owes it to themselves to play the original which is full of the same humor that made the SNES sequel so popular.