Future of the Time Dragon: A Branches Book (Dragon Masters #15)

The dark wizard Maldred has trapped dragon master Eko as well as wizards who have opposed him, all of them frozen in time and space inside a wall in his hideout; so Drake and Worm set out to seek the help of the Time Dragon-but when a imp named Beezel interferes Drake ends up back in his own past, and he must find a way to get back to the present.