Ten years after discovering the Stargate, Professor Langford and his daughter Catherine face a foreboding threat when a Nazi officer arrives at the warehouse where they are studying the artifact.
Catherine appeals to Captain Beal and his fellow soldier, Wasif, for help in rescuing her father. Elsewhere, Brücke experiences a close encounter he did not anticipate.
Catherine, Beal, and Wasif quickly find themselves in over their heads after they arrive on another world, where they encounter a powerful alien warrior.
Hoping to lay low, the team follows their new guide to a native settlement – while the Germans plot to forge an alliance with the planet's alien masters.
Aset brings her guests to the outpost of Nosdevli, where a test of combat soon ensues to demonstrate a servant's worth to his master – and putting Brücke in a difficult position.
Beal leads a team to infiltrate Aset's temple, while Catherine and Kasuf go in search of a way to dial the Stargate back home. Meanwhile, Professor Langford decides to take his stand.
