Captain Marvel's villains included characters who resembled other publishers' characters, or whose names were actually already in use by other publishers. The super-stretchable master of disguise Plastic Man (see
Plastic Man), an evil alien from the planet
Venus, The bristly-mustached
mad scientist Dr. Fate (see
Doctor Fate) was torn between a desire for revenge and his obsession with learning the
electronic secrets of the android he called a "human thingamajig". Other characters were only somewhat less legally contentious. The handsome Prof. Doom of the subversive organization B.I.R.D. (Bureau of International Revolutionary Devices) secretly performed on-campus
mind control experiments which endangered Prof. Winkle's tentative relationship with the university president's daughter Linda Knowles. Colonel Cold was a
bioterrorist who secretly hid capsules containing a deadly
virus in
ballpoint pens and distributed them throughout the city. Nuclear physicist turned metal-mouthed pirate Atom-Jaw could bite through solid steel. However Captain Marvel's true nemesis, the only foe he actually "hated" (because he was pre-programmed to by his makers), was the Destroyer (no relation to the
Marvel Comics character). An android like himself, the skullcap-clad Destroyer was a burly and literally fiery-eyed
weapon of mass destruction who, in addition to being virtually indestructible and able to fly through the vast depths of space, could shoot devastating blasts of flame out of the yellow circle on his chest and had magnetic hands designed to grapple with his metal-bodied foe. Created by the enemy Volcano People of the hero's home planet, the Destroyer also escaped the death of their world and was now allied with Earth's own hostile subterranean race. And then there was Tinyman, a miniature human being who, in an inversion of
Ant-Man and the
Atom's powers, could grow to normal adult male size and quickly shrink back down again. ==Other appearances==