The Origin of Stretch Armstrong (partially found action figure-licensed comic book; 1992)
Stretch Armstrong is an action figure introduced by Kenner in 1976. The figure could stretch up to four feet, and bend into different poses, then stretch and bend back into his original shape. Kenner stopped producing him in 1980, though a few attempts to reintroduce him have occurred since then.
From 1992-1997, Cap Toys relaunched Stretch Armstrong as a pliable superhero, with a variety of other aliases. Initially, this figure also came with a free comic book detailing his origin. As of November 2017, only the first and last pages have turned up online, since advertiser Scott Edwards shared them on his Pinterest page some time in 2015. From this scan, the comic appears to have ran at least eight pages total, and traced Stretch Armstrong's journey to find his estranged father. Aside from Stretch becoming part of a crime fighting team (none of whom, except for Stretch and his dog Fetch Armstrong, actually received their own toys) before the story's end, the rest of the plot remains unknown.
Hasbro purchased Cap Toys in 1997, making them the current owners of the Stretch Armstrong trademark (and through an earlier merger with Kenner's parent company Tonka, the owners of all of Kenner's most famous toys). Hasbro has also translated Stretch into printed media a few times. For instance, the 2011 comic Unit: E explored the worlds of different Hasbro-owned toys, including an updated version of Stretch Armstrong. Later, the Fall 2017 premiere of a Netflix-exclusive animated series, Stretch Armstrong and the Flex Fighters, resulted in IDW announcing that an ongoing comic about Stretch would begin in January 2018, as a tie-in with the show. Both of these incarnations hail no connection to Cap Toys' telling of the character's origin.