In order to boost his network’s ratings, UBC president Samuel Tanner orders Dr. Peter Silverstone to create a new super-hero for them to feature, and is rewarded with Blackrock, who becomes a foe of Superman.
A new super-hero hits the streets of Metropolis – Blackrock. Superman tries to save a runaway hang-glider from crashing into buildings, but Blackrock hogs the spotlight, taking credit for the "save" himself. Superman suspects that Blackrock may be placing people in danger just so he can save them. Back at the GBS station, Clark begins suffering from bizarre mental flashbacks. He continues to see images of his own news broadcasts flashing through his head. He does not have time to investigate it however, as a robbery is taking place at a jewelry store. Blackrock arrives and stops the thieves, knocking them out. Superman berates him for the haphazard way in which he handled the situation.
Superman later learns that Blackrock is actually Sam Tanner, president of UBC, a broadcasting station that competes with GBS. Tanner wanted to market his own super-hero, and so he had inventor Pete Silverstone construct the Blackrock technology. But what Sam does not realize is that he is Blackrock. He does not remember the time he spends as a superhero.
Superman squares off with Blackrock and defeats him. With Pete Silverstone's help, he scrambles the broadcasting technology that Blackrock has been using to power his arsenal. Blackrock turns back into Sam Tanner with no knowledge of his alter-ego.
After saving him covertly from a knife-wielding thug employed by a gangster named Sal, Linda Danvers discovers that Greg Gilbert owes Sal $30,000 in gambling debts. Later, Gilbert cuts a deal with Gilbert to get him into the Galaxy Broadcasting Company building in return for taking care of Sal. Since that sounds like murder to Gilbert, he gets in touch with Lena Thorul, who has been having strange headaches lately, and Lena gets in touch with Supergirl, who has already had an encounter with the new Blackrock. Supergirl tracks Blackrock down when the villain attacks Sal's casino, but is beaten in a fight with him and rendered unconscious. At the same moment, Val Colby and his grandmother enter Lena's apartment and find Lena also unconscious, sprawled on the floor.
Lena Thorul is taken into emergency surgery for an operation on a cerebral hemorrhage. Supergirl, reviving and renewing her battle with Blackrock, learns from the villain that he didn't intend to kill Sal, just scare him out of town. Supergirl replies that it still makes him guilty of extortion. After escaping, Blackrock induces Greg Gilbert to try to steal plans from GBS's vault for an experimental 3-D television process. Supergirl stops Greg from doing so, then uses him as bait to lure Blackrock into another encounter. She finally defeats Blackrock by getting him into a tunnel where the broadcast waves that power his black powerstone cannot penetrate, and crushes the stone. Supergirl then unmasks the new Blackrock as Dr. Peter Silverstone himself. Later, as Linda Danvers, she learns that Lena has made it through surgery with only a slight speech impairment. But Lena awakens from sleep having dreamed that Lex Luthor is her brother. And when she sees in a bathroom mirror that her head has been shaved for the operation, she seems to note the family resemblance.
Powerstone, a baseball sized rock strapped to the palm of his right hand. Powerstone receives radio- and TV-waves, converting them into energy which can be used to cast illusions, short out communication devices, transform himself into ionic particles he can transmit around the world at the speed of light.
- This version of Blackrock, including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 5 Appearances of Peter Silverstone (Earth-One)
- 1 Images featuring Peter Silverstone (Earth-One)
- Quotations by or about Peter Silverstone (Earth-One)
- Character Gallery: Peter Silverstone (Earth-One)
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