Originally Posted by Allanimal
Whatever you do, do not "give" them an über-powerful DMPC who saves the day. Doing so takes away any sense of accomplishment if they win. They should not feel like spectators in the game of DM's dragon vs. DM's NPC.
Or alternatively, give them an uber powerful NPC, who gives them tactical advice, teaches them how to fight dragons, whittles down its hitpoints a bit and then gets eaten (not swallowed whole, chewed up and then swallowed)