Phantom Heavies are a group that appear in  . They are modified versions of the Sonic Mania Hard Boiled Heavies that engaged Sonic and his friends during their showdown with Dr. Eggman in the Titanic Monarch Zone.
Sonic, Tails and Knuckles got to the Titanic Monarch Zone, four of the Hard Boiled Heavies, now modified into Phantom Heavies, were able to take on the trio when Eggman sent them to their arenas using his Phantom Egg. Despite each of them getting a turn though, none of them were able to stop Sonic and co.
Upon reaching the
Egg Reverie Zone, the Phantom King (a modified Heavy King) tried to steal the Phantom Ruby for himself, prompting Eggman to battle the Phantom King using his Klepto Mobile in an attempt to take the gemstone back. Sonic, having all seven of the Chaos Emeralds, transformed into Super Sonic and defeated both of the power-hungry monarchs however. With the Heavy King's defeat, the Phantom Heavies seemingly ceased to exist, but their ultimate fate remains unknown.
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