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This is Heavy Dog. Target has been sighted: proceeding to engage and neutralize.

— The Heavy Dog, Shadow the Hedgehog

Mantis Platoon HD1/Heavy Dog is a vehicle that appears in the Sonic the Hedgehog series. It is a giant battle mech operated by the Mantis Platoon of the Guardian Units of Nations, being the same model as the Blue Falcon.



Shadow the Hedgehog

In Shadow the Hedgehog, the Heavy Dog was used by a GUN Soldier in an attempt to stop Shadow the Hedgehog from harming anyone fifty years prior to the events seen in Sonic Adventure 2, when Project Shadow was discontinued. In the flashback of this time, Shadow saw Maria die at the hands of the Heavy Dog's pilot. It wields a particle beam cannon and several weapons on its side which can be broken off and used against it.


Heavy Dog is the boss fought after completing the Dark mission of The Doom in Shadow the Hedgehog. The guide for this battle is Doom's Eye.

Boss guide

This vehicle is fought on a metal platform with raised platforms; these can be used to avoid the particle beam cannon, however the cannon can also reach this area. The Heavy Dog releases explosives that can be used as stepping stones to attack or disable a cannon that fires the same missile as an RPG. If the machine's RPGs are attacked enough, they will fall off for the player to use.


Name Artist(s) Length Music track
"Boss: Heavy Dog" Jun Senoue 1:40



"Mantis Platoon, Heavy Dog Reporting in. Primary target, and the girl have been located. Acquiring Targets. En route to intercept and destroy."
—The Heavy Dog, Shadow the Hedgehog
"Mantis platoon Heavy dog to HQ, come in! Requesting emergency assistance in eliminating targets!"
—The Heavy Dog, Shadow the Hedgehog
"Critical damage taken to fuselage! We're losing... aaaaargh!"
—The Heavy Dog defeated, Shadow the Hedgehog
"Charging particle beam cannon!"
—The Heavy Dog, Shadow the Hedgehog
"Energy charge complete!"
—The Heavy Dog, Shadow the Hedgehog
"Particle beam cannon... fire!"
—The Heavy Dog, Shadow the Hedgehog


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