His real name is James J. Barney, and his rank is that of sergeant E-5. Grand Slam was born in Chippewa Falls, Wisconsin. His primary military specialty is artillery and his secondary military specialty is an electronics engineer. He received initial training in conventional artillery and served with a 155mm battery. He graduated at the top of his class from Special Weapons School. Grand Slam also graduated from Artillery School & Advanced Tech School as well as being a qualified expert with the M-16, M-1911A1, the H.A.L. and JUMP. He has an uncanny ability to estimate distances and plot trajectories with amazing accuracy. He is also noted for being an introvert, losing himself in escapist fantasy such as science fiction novels and comic books.
Toys
Grand Slam appeared first as part of the original 1982 toy line, and was packaged with the "H.A.L.". All of the original sixteen figures from 1982 were released with "straight arms." The same figure was re-released in 1983 with "swivel-arm battle grip", which made it easier for figures to hold their rifles and accessories. In 1983, the Grand Slam figure was also recolored with silver pads on his arms, legs and chest, and recast as a laser jet pack soldier, packaged with the J.U.M.P.. In 2007, a brand new incarnation of Grand Slam was released in the 8" Sigma 6 line. This was the only Grand Slam toy to ever feature a unique head sculpt. Every other version of him used a repainted head from a different character. A 25th Anniversary/Modern Era figure was released with a recolored SHARC in 2008. A Rise of Cobra figure was released as a Target exclusive with a different color scheme and lower legs. Another movie figure using the original 25th Anniversary mold was packaged with Hawk and Laser Artillery Weapon as a Wal-Mart exclusive. Grand Slam appeared once again in 2014 as a part of the G.I. Joe Collector Club's Figure Subscription Service sporting the original 1982 color scheme with the same portable missile launcher included with most versions of the Cobra weapons specialist Scrap Iron figures.
In the Marvel Comics G.I. Joe series, he first appeared in #1, along with the rest of the original team. The entire team attacks a Cobra stronghold to retrieve Dr. Adele Burkhart, a famous pacifist and scientist with national secrets. The mission is successful, though Cobra Commander escapes. Several months later, after a battle at the United States Treasury building, Grand Slam and Stalker spot Major Bludd trying to escape Washington, D.C. aboard a hijacked bus. The two Joes pursue Bludd on a RAM motorcycle. Grand Slam climbes on top of the moving bus and kicks through the glass front window. He subdues Major Bludd with several punches. These wounds are then exaggerated by Bludd and a Cobra agent doctor. The two accuse Grand Slam of excessive force as part of an escape plot that ultimately fails. Grand Slam is also featured in G.I. Joe #59. He and other Joe soldiers are attacked by Cobra forces while returning from weapon testing. He appears in issue 82, supervising the new Joes Repeater, Budo and Lightfoot. They are backup to stop a Cobra-backed theft of valuable weapons. The four succeed, but Grand Slam is severely wounded in the fighting. He survives.
He has appeared in many of the Joe comics produced by Devil's Due. Grand Slam is one of the many Joes called back into action to fight against Serpentor in the second Cobra civil war. Like the first one, this takes place on Cobra Island. Later, he is one of the guards for Scrap-Iron and Major Bludd at Blackwater Prison.
IDW
Grand Slam had very little exposure in the IDW reboot of the comic. He first appeared in G.I. Joe Origins #7, but he was unceremoniously killed by a sniper on the same page in which he was introduced. However, in 2017 series he was revealed to be alive. In the alternate universe continuity of G.I.Joe: Revolutions Grand Slam was severely wounded in a friendly fire incident when he was mistakenly believed to be one of the shape-shifting Dire Wraiths. Later he is seen paralyzed from the waist down. Grand Slam still contributes with his technical knowledge, however he remains bitter due to his injuries.
Animated series
Sunbow
Grand Slam appeared in the original animated series. However, he only appears in the opening to the A Real American Hero mini-series, making him the only one of the original Joes to not have a significant appearance in the animated series.
