Cap'n O. G. Readmore's Jack and the Beanstalk is a rare ABC Weekend Specials episode and as well as the first episode of the ABC Weekend Specials host Cap'n O. G. Readmore. It is based on the fairy tale Jack and the Beanstalk. The special aired in October 12, 1985 on ABC.
The plot of the back cover of the 1993 VHS release says (It's hard to make out but here's what I've gathered - RetroGameFan9000, aka Ethan M. Nelson):
"Cap'n O. G. Readmore and his friends, Kitty Literature, Ol' Tome Cat, Wordsy, Lickety Page and Dog-Eared, hold their Friday Night Book Club meeting in an alley next to the public library. When members of the Book Club start to poke fun at some of the characters from their favorite fairy tales, the bookshelves part and Cap'n O. G. is confiscated by those some characters. Jack (from Jack and the Beanstalk) challenges Cap'n O. G. to take his place in the story. When the Cap'n accepts, the fun begins!"
Only VHS releases, a Korean DVD release, cels, a few newspaper ads, and voice actors for the episode exists and no footage of this special have been uploaded on the Internet.
Update 6/26/16: Kristie Ann Webb has a copy of the special and hoping to upload it on YouTube in the future.
References
http://voicechasers.com/database/showprod.php?prodid=1225 Voice Chasers article.
http://www.dvd.co.kr/shop/shopdetail.html?branduid=88742 A completed DVD collection from the Korean DVD website including the Jack and the Beanstalk.