Big Bad: Gargoyle formally enters the series narrative with this episode.
Covert Pervert: While in the Neo-Atlantean factory forge, Nadia adjusts her tube top to cool off from the heat. Even despite the circumstances, poor Jean can't help but look (and gets slapped for it).
Downer Ending: Marie and King are captured by Neo-Atlantean forces and Nadia is about to join them. The only silver lining is Jean gets away with the Blue Water to keep it out of enemy hands.
Failed a Spot Check: Nadia and Jean are so busy arguing that they don't notice Marie and King have left the cave until Marie's captured and screaming.
Likewise, the Neo-Atlanteans don't do a sweep of the immediate era and miss Jean and Nadia.
Foreshadowing: The Blue Water resonating with the Tower's artificial Orihalcum hints at a common origin, along with Gargoyle having an imitation.
Heroic Sacrifice: Nadia sacrifices herself to ensure Jean gets to safety and with the Blue Water in tow.
Hope Spot: The Grandis Gang gets one when it looks like they'll be able to escape the slave labor...only to be quickly recaptured.
Spanner in the Works: Jean and Nadia had no way of knowing the Neo-Atlanteans were manufacturing artificial Orihalcum, or that it would resonate with Nadia's Blue Water and alert Gargoyle the teens had entered the base.
Too Dumb to Live: Marie wandering out of the cave to play even though Jean has been warning Nadia that the island was crawling with Neo-Atlantean soldiers. Justified, though, as she is a 4 year old and doesn't fully understand what's going on.
Wham Shot: Gargoyle disembarking the Garfish, introducing us to the true power behind Neo-Atlantis and the real Big Bad of the series.