This is a list of quest series which includes all quests that are recognised to share a common and continuing plotline. Quests in a series have a clear sequence and usually share the main protagonist(s) and/or antagonist(s) as well as the general storyline. See the quest series section of the quests article for further information. Some quests are in several series, such as Desert Treasure being both a Mahjarrat quest and a Return of Zaros quest. Likewise, many series are subseries of a larger one, such as the Sea Slug quests being a subseries of the Temple Knight series.