Walt Disney's World of the Dragonlords #1

Donald corrals his resentful relatives into a family togetherness picnic, which is crashed by Brendon and Hintermann, warriors magically fleeing another dimension. When Morg warriors riding dragons chase them through the portal, Brendon and Hintermann escape back to their own world. Nurg and Snark again pursue, taking the Ducks along as slave captives, but leaving their unconscious comrade Groob behind.