Grand Slam has a life-long fascination with technology born out of his love for science fiction stories and comic books. He also has a passion for ancient artillery and one of his hobbies involved miniature recreations of catapults, trebuchets and cannons. It is also a hobby that got him in trouble on occasion with those less patient with his practical jokes, he hurled small stones and papers with these working miniatures. Nevertheless, he became an expert in calculating distance and trajectories, the necessary elements in artillery work.
He studied electronics engineering before enlisting. One of his primary reasons for joining the military was that it was one organization that is always on the forefront of technology. While a science geek at heart, he is also very much a man of action as he has become an expert with operating the H.A.L. laser cannon and flying around with the J.U.M.P. jet pack.
A Real American Hero continuity
Marvel Comics continuity
Grand Slam is a member of the original roster of G.I. Joe members. One of his earliest chronicled missions is the rescue of Dr. Adele Burkhart from Cobra. He provided artillery support for his teammates while putting up with Clutch's crazy driving.
Devil's Due Comics continuityWrite up
G.I. Joe Reloaded
Animated continuity - Sunbow
|A Real American Hero (1982)
Appearance: brown hair; dark-green shirt with silver red-padded vest; black gloves; dark green belt and red-padded pants over black boots.
Accessories: dark green "Breaker" helmet; clear visor. (Prototype visor was black.)
|A Real American Hero (1983)
Appearance: brown hair; dark-green shirt with silver padded vest and silver on arms; black gloves; dark green belt and silver-padded pants over black boots
Accessories: dark green "Breaker" helmet; clear visor
|2007 International G.I. Joe Convention|
|Attack on Cobra Island (2008)|
- Larry Hama's preliminary filecard for Grand Slam had a quote at the bottom from Breaker: "...shoot--'ol Slam, he's a wily one... always got that look in the eye like he's not there, but look out! He's got the whole shootin' match covered. When Grand Slam is layin' down the ol' cover fire, heck--ain't nobody got nothin' to worry about. You writin' all this down?"
- The Season 5 episode of the CBS television program NCIS that aired October 16, 2007 - "Identity Crisis" - assigned many of the guest stars and incidental characters the names of G.I. Joe characters. The name George Barney was used for a man who had died several years prior. An uncredited actor provided the photo of Barney.