Strelok has been one of the greatest stalkers the Zone has ever seen, but even he couldn't do many of the feats he achieved without support from others. He maintained a very tight, close knit circle of friends with whom he scoured the Zone, looking for a way to reach the center of the Zone and figure out the nature of the Monolith.
Usually, he traveled with Ghost and Fang. They made several trips beyond the Brain Scorcher and eventually managed to reach the power plant and penetrate the Sarcophagus, locating the access door to the Monolith Control Center. Chased out of it, Strelok was nearly shot to death just moments before an emission, but, at great risk to themselves, his friends managed to haul him off to a safe spot.