The massive Blackout has been described as the "hound" of Megatron. In better days he was always to be found looming powerful and silent behind his leader's right shoulder. When given a target he hunts it down with fierce determination. Blackout is not surprise with the progress Starscream is making towards finding the missing Decepticon leader. He suspects (quite rightly) that Starscream would prefer Megatron to stay lost. Blackout is openly mutinous and will challenge Starscream's leadership at any opportunity, not for his own sake, but to better serve his ultimate goal of finding his lost master. Blackout has a sneaky side and uses his symbiotic companion Scorponok's small size to great advantage.
His alt-mode is a MH-53J Pave Low III