ALLEY OOP AND THE CAPTIVE PRINCE 1985 Dave Graue

We begin when Alley finds a spaceship crashed in Moo with aliens who are not friendly.  Then a cursed princess begs Alley Oop to rescue her son -- and break the wicked spell! Can Alley defeat the evil sorceress with only a stone axe and a handful of magical tricks? Alley gets lost in time with a young prehistoric lad --they become knight and squire questing for the Holy Grail of Castle Blackrose. And finally, a close encounter with a two-headed pterodactyl!