Grand Slam is a member of G.I. Joe. As a weapons engineer, his proficiency with understanding and reverse engineering alien technology has made him an invaluable member of the team. Unfortunately he hasn't had the best luck with not getting shot out in the field.
Grand Slam was part of G.I. Joe Team Alpha on a mission to retrieve network files from the Ichkerian mafia. When the Joes were found out, Grand Slam was shot and seemingly killed but was able to make a recovery thanks to the team's top flight doctors and medical technology.
At the time of G.I. Joe's recommissioning in 2016, Grand Slam was stationed at the Earth Defense Command base at Bikini Atoll, and was the only human who managed to survive the Dire Wraiths' infiltration and subsequent takeover of the facility. Holing up with and defending Skywarp, Grand Slam managed to fend off the aliens for two days before a team led by Scarlett arrived to investigate why the base had gone dark. When Rock 'n Roll finally found Grand Slam's hiding spot, Slam brandished a laser rifle at his former teammate, believing him to be one of the Wraiths. Despite Rock 'n Roll's insistence that he was who he said he was, Grand Slam refused to stand down, forcing Rock 'n Roll to shoot him. While he was able to survive yet another seemingly fatal gunshot wound, this one left Grand Slam paralyzed from the waist down, confining him to a wheelchair.
Despite his injuries, Grand Slam remained part of G.I. Joe, stationed aboard the team's new underwater base Lemuria, and worked together with the Docs Junior and Senior on a device capable of detecting Dire Wraiths. As the elder Doc scanned his daughter and then himself, Grand Slam was frustrated to find the device reading both of them as Wraiths. Just then, Rock 'n Roll entered the lab wanting to talk with Grand Slam, who claimed he was far too busy to talk with him. When Rock told him all he really wanted was to be given a laser weapon like the rest of the Joes, Slam brusquely presented him with laser shotgun before wheeling off, reminding Rock that he was responsible for his current condition.
As he made more and more adjustments to his scanner, Slam continued to be confused why it still read Doc Senior as being a Wraith. Just as Doc suggested they take a break from it, Skywarp made his way into the lab demanding that the two scientists finally get around to fixing his broken teleportation abilities. Though Grand Slam made no promises he'd be able to figure it out, he still agreed to take a look. Lifeline had stabilized Doc, Grand Slam asked what they would do. Skywarp opined that the Joes should kill the Wraith, but Grand Slam and Scarlett refused on the grounds that Doc was their good friend. When the younger Doc returned from the field and was promptly detained in her quarters, Slam argued with Scarlett over whether or not it was right for them to keep one of their own locked up. When Lifeline opined that they should be keeping her in the lab for study, Slam took offense and reminded him that Doc Junior was only half Wraith and that her father had saved his life.Just as Skywarp seemed at his wit's end with the two of them, Grand Slam finally gave him the go ahead to try teleporting again. However, something suddenly went wrong, causing the machine Skywarp was hooked up to to explode! As he shielded himself from the blast, Grand Slam was shocked to find Doc Senior revealing that he actually had been a Dire Wraith all along, assuming his true form as he dove to protect Slam from some incoming shrapnel. After Scarlett had been called to the scene and
In preparation for G.I. Joe's expedition to the center of the Earth to dispatch the Fatal Fluffies, Grand Slam and his team created the Mole Pods. While he presented these new vehicles to the field team, Slam was annoyed by Rock 'n Roll showering him with praise and told Rock to stop trying to kiss up to him.
Given that it wasn't as defective as it seemed, Grand Slam gave Scarlett a Wraith scanner for the field.
- Given that Grand Slam's first appearance in the IDW continuity involved him getting shot in the head, many assumed his reappearance in Joe's Revolution tie-in was a new character who had inherited the codename until writer Aubrey Sitterson confirmed they were the same guy in the letters page of G.I. Joe vol. 5 #3. Funnily enough, Slam's "corpse" was carried off by Rock 'n Roll in his Origins appearance.