Gorp the goblin is fleeing his lands in search of better employment. With only a cloth map to guide him, he sets out across the sea to secure work at Ye Olde Dungeon working for the sinister Dungeon Overlord Jamalin Spellslinger. Once there, along with a group of misfit monsters, Gorp is hired on as a janitor to clean up the messes left behind by the horde of fortune, glory, and treasure seeking adventurers. But all is not well within the dungeon as the Red Dragon has ideas and an agenda of his own.

Gorp the goblin through a series of unlikely events finds himself in charge of Ye Olde Dungeon as the new Dungeon Overlord. Gorp has made great improvements and increased the efficiency of dungeon operations, but a new threat from the west brings an unwelcome change to the realm in the form of an orc invasion. Not only is the dungeon in trouble of being overrun by orcs, but King Gilden blames Ye Olde Dungeon as the cause of the invasion. That is until the Fae Kingdom offers an alliance after Gorp helps rescue the fairy princess who has been lost in the City of Tents to the south after a bad break up.

Gorp the goblin has climbed far from his humble beginnings as a goblin janitor in Ye Olde Dungeon. With operations of dungeon coming to a halt due to the orc invasion from the west, Gorp the Dungeon Overlord must now travel outside the safety of his dungeon and finally meet with King Gilden of Hallstorm Castle. However, things do not go as planned and Gorp is captured by the orcs on his journey to the castle, setting into motion multiple events with uncertain outcomes for the whole realm. The orc forces are growing stronger and it is up to Gorp and his trusted goblin companions to find a way along with the humans and fairies to defeat them and become the Defender of the Realm.