Marvel Comics continuity
Hot Spot led a team of Autobots sent to Earth by Optimus Prime to counter the threat of a Cobra-rebuilt Megatron. Megatron's new form was more than a match for them, however, and nearly all of his team were destroyed. Only Hot Spot and Skydive survived the encounter.
As the last survivor still on Earth, Hot Spot observed Cobra hauling a trailer of Transformers technology salvaged from the Ark, and noted that his orders included keeping Autobot tech out of the humans' hands. He single handedly attacked the convoy, drawing fire from numerous Cobra tanks, until he managed to destroy the trailer by ramming it off the side of an embankment. Weary and on the brink of shut-down, Hot Spot self-destructed to keep Cobra from using his own body as a replacement source of technology.