Blobert was the name given to the gooey white pet blob of the nameless protagonist of A Boy and His Blob: Trouble on Blobonia. Blobert had the unique ability to shift into many different shapes depending on the flavour of jellybeans he was fed, usually with an amusing relation to the name. For example, feeding Blobert a punch-flavoured jellybean would turn him into a hole in the ground, through which the Boy could descend. Set in the far-off future year 2001 (when every kid on the block has a pet from another planet), the plot of the game, such as it was, involved the Boy and Blobert travelling to Blobert's homeworld, planet Blobonia, to overthrow the evil tyrant who had the blobs living in misery.
A single sequel to Trouble on Blobonia, A Boy and His Blob in... The Rescue of Princess Blobette was released for the Game Boy in 1991. The Boy and Blobert returned for more jellybean-fuelled adventures.
Another sequel, simply titled A Boy and His Blob, was in development for the Nintendo DS, but was cancelled in 2007. Supposedly, the game was in a finished state, but the money problems of publisher Majesco meant it was never officially released. In this game, Blobert would have had more of a face than he originally did, and have been coloured a dark green instead of his classic white.
Finally, a new game, again simply titled A Boy and His Blob, was released for the Nintendo Wii in 2009. Essentially a retelling of the storyline of the original game, the Boy and the Blob (who no longer has a proper name) must travel to Blobonia to save the blobs from a cruel dictator.