Gelshark

In some ways, Gelshark (Sky-Byte) is one of the central characters on the show. All he wants is for Gigatron (Megatron) to see him as the loyal and dependable warrior that he really is, and he goes to great lengths to prove his resourcefulness to him. Although heralded as one of the mightiest Destronger warriors, Gelshark has summarily failed to live up to his hype during Gigatron's campaign on Earth. Unfortunately for Gelshark, things seldom turn out as he has planned them - if it isn't the Cybertrons (Autobots) who thwart his plans, it is the three fools he has under him. And then there's the new threat, Black Convoy (Scourge); that ingratiating newcomer who tries to assume his place as Gigatron's second-in-command.

(Source: Wikipedia)