The Robot Guards were four male sentient robots from the 2017 Continuum
These four identical, hulking robots, who could only be told apart by the numbers on their sweaters, served as guards for Black Heron's island lair in the 1960's. They fought S.H.U.S.H. agents Scrooge McDuck and Bentina Beakley, who managed to destroy all but Number 3, who fled after losing an arm. Number 3 stayed on the island, alone, for decades, mourning his fallen comrades. Finally, in 2018, both his old boss Black Heron and Scrooge returned to the island; Number 3 briefly took service again, but was effortlessly kicked into the piranha pool by Scrooge, just like Number 4 had been all those years ago.