The Adventures of Ook and Gluk Jr: Kung-Fu Cavekids in Outer Space is a possible upcoming sequel to The Adventures of Ook and Gluk: Kung-Fu Cavemen From The Future. It was teased to be "coming soon-ish" on the last page of its predecessor, although no release date has been announced. Since the book has been in development hell for several years, there have been rumors that it was cancelled although nothing was officially confirmed.

The book would star Ook Shadowski, Jr.,Gluk Jones, Jr., and Lily Jr. and the return of Ook Shadowski, Lan Wong, Gluk Jones, Gak Shadowski, and Lily (Who now resembles Mog-Mog), as their children are sent to outer space on a rocket, fighting against aliens.