Lonzo Wilkinson grew up in Detroit, Michigan, the youngest of three brothers. After both of his brothers died in a gang-related incident, Wilkinson decided to join the Army hoping it would provide him a better life. He quickly graduated from Monterey Army Languages School, becoming the youngest Army Ranger in history. His proficiency in combat and mastery of several languages soon attracted the attention of Joe Colton, who was looking to rebuild his Adventure Team. Given the codename "Stalker" for his tracking abilities, Wilkinson joined the team alongside G.I. Joe, Mayhem, Atomic Man, and Bulletman.
One of his Adventure Team missions brought Stalker to the Tomb of Amtoltec. While Joe investigated inside the pyramid, Stalker and Mayhem battled an army robotic mummies. Unable to contact Joe, the two found themselves outmatched and Stalker radioed Atomic Man and Bulletman in for reinforcements. Stalker lamented the fact that having costumed heroes around was "madness" before receiving an emergency beacon from Joe, who was dealing with a group of robot mummies of his own. Joe noted that the mummies looked familiar, leading Stalker to connect them to the IRON Troopers from World War II.
As the rest of the Adventure Team arrived to help Joe fight against Soundwave, Stalker tried to destroy the Decepticon by crashing the Adventure Team's vehicle into the robot, with little success. Joe assured Stalker that he would go places. Soundwave soon retreated, leaving Joe and Stalker to be crushed by a falling boulder. Fortunately, the pair were saved by the newly-Talisman-enhanced Atomic Man.
During a mission to rescue Dr. Emil Burkhart, the Adventure Team was pinned down by IRON Troopers. Stalker expressed his doubt at the Team's survival, something that annoyed Mayhem. Ultimately, they were unable to save Dr. Burkhart, something which hit Atomic Man hard.
By 1994, Stalker was still part of the Adventure Team, which by this point had been renamed "Adventure Force." Adventure Force infiltrated Garrison Kreiger's Brasnyan facility in search of Mike Power, who had been working with Kreiger since the Burkhart mission. Upon their arrival, they discovered the aftermath of a test of Project: Iceman. Stalker found Mike in the rubble, but confirmed that he had no heartbeat. However, they had another matter to deal with in the form of the time-traveling Sgt. Savage, who arrived in the present after Mike activated the Talisman.
After Adventure Force was shut down, Stalker was one of the first recruits to the newly formed G.I. Joe team, named for his old mentor. One of their first missions took him, Scarlett, and Hawk to Mount St. Helens, where the Joes encountered a Decepticon named Bugly. The Joes were outmatched, but were saved by Sgt. Savage, shooting at the Transformer from his P-40 Warhawk, and Centurion. Hawk was annoyed at the new arrivals' presence, but Stalker was willing to vouch for Savage. The humans followed Centurion as he dragged the defeated Bugly inside the volcano to the facility of Project: Hot House, a joint project between Joe Colton, Garrison Kreiger, and Joshua Red of Skywatch. Colton welcomed them, but told them that only Savage was cleared for further entrance to the facility. Stalker bitterly expressed that Colton wasn't the same man he used to be, as the old Joe would never work for the man who murdered Mike Power.
After the Revolution
Stalker was part of the G.I. Joe unit sent to retrieve Astrotrain's head, maintaining security around the site. However, they were attacked by V.E.N.O.M. agents Vanessa Warfield and Cliff Dagger. Stalker tried to stop Dagger, but was quickly taken out by Warfield, allowing them to steal the head. Later, Stalker was at Lifeline's bedside in M.A.S.K. HQ when the medic awoke, bringing him to the meeting between G.I. Joe and M.A.S.K. As the Joes and M.A.S.K. co-ordinated their efforts to recover the rest of Astrotrain's body before V.E.N.O.M., Stalker flew Tunnel Rat and Brad Turner to the Congo Basin for their assignment. He later returned to M.A.S.K. HQ, where he watched over the recovery of Julio Lopez.
During the Revolutionaries' hunt for Garrison Kreiger, Mayday asked Stalker for information regarding Project: Iceman. Stalker played coy about it, but was able to set her up with some back-up in the form of Matt Trakker and Gloria Baker of M.A.S.K.
- Revolutionaries retconned Stalker into a member of the Adventure Team, basing his appearance off the "Adventurer" figure from the 1970s Adventure Team toyline (released in the Action Man line as "Tom Stone".)