Warning: SPOILERS for Amazing Spider-Man #18
Marvel's Spider-Man has yet another Doppelganger (aside from his many variants and clones), and this one uses a once-peaceful gadget as an actual weapon. Peter Parker's been through the wringer as of late, losing most of his family and friends after making a fateful decision that left a massive crater in the Arctic and all but destroyed his personal life. Now, Amazing Spider-Man #18 reveals Peter's life could always be worse - he could have a demonic version of himself named Rek-Rap.
In current comics continuity, Spider-Man is plunged headfirst into the Dark Web event, a crossover that began when Chasm (Peter Parker's clone Ben Reilly) joined forces with Madelyne Pryor, the clone of Jean Grey. Chasm plunges Manhattan into a terrifying situation: inanimate objects come to life and began to eat civilians. While the X-Men and other superheroes attempt to save as many people as they can, Spider-Man is pulled into Limbo, where he's met by otherworldly demons and a hellish reconstruction of the Daily Bugle offices.
In Amazing Spider-Man #18, written by Zeb Wells with art by Ed McGuinness, Spider-Man comes face-to-face with Rek-Rap, a super-strong demonic variant of Peter Parker. Rek-Rap, despite his otherworldly nature, is ultimately heroic (if perhaps a bit too violent) and eagerly attacks the Limbo version of the Sinister Six. He finishes off the version of the Scorpion with a punch from the "Spidey-Spranger" - which Marvel fans may notice as the rarely-used Spider-Signal.
The Useless Spider-Signal Is Now A Weapon
Created by Stan Lee and Jack Kirby, the Spider-Signal was a rarely-used gadget that hailed from a bygone age. When used as intended, Spider-Man would shine the signal - a projection in the image of his mask - at criminals caught in the act of robbing banks or breaking into houses. The device was presumably used to create fear in the hearts of the criminal element, and was perhaps inspired by vigilante stories of the 30s and 40s. Unfortunately, the device was next to useless; it couldn't be used during the day, and supervillians (whom Spider-Man fought more and more often) cared little for Batman-esque theatrics.
Even the MCU ignored this device: the Spider-Signal was teased at the end of Captain America: Civil War, but it has never made an appearance in Spider-Man: Homecoming or any other film since. Just as well; the flashlight has never appeared to be a vital device for Peter Parker. But for Rek-Rap, this once-peaceful Spider-Man device is now a cartoonish weapon.