Marvel comics continuity
Located in Decepticon-held Polyhex, the Dead End is neutral in the civil war due to the fact fact most of it's residents are the derelict Empties. The large number of non-Decepticons make it a prime location for Autobots to regroup, hide and seek information for raids upon the Darkmount. The Decepticons in turn use it's residents for target practice, and as resources grow ever more scarce as the war drags on as fodder for the Decepticon Harvester Units to be melted down in the Smelting Pool and used to create new Decepticons.
Deranged by being unable to confirm if Optimus Prime was truly dead, Megatron blasted the Space Bridge while he was standing on it and was seemingly killed, however the explosion had catapulted him into the Dead End. After his self-repair systems were able to partially revive him, he wandered and lived with the Empties, with no recollection of who he was, until he stumbled upon Sports Car Patrol leader Blackjack being ambushed by two Autobots. Blackjack crying out his name and the sight of the Autobrand returned Megatron to his senses, and he blasted the Micromasters' attackers.