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|“You said this Strong-Cave could withstand the Grief-Bringer!”|
“Well, we thought it could, but it's never been tested against the resurrected skeleton dragon and an army of evil skeletons!”
|— Kai and Gulch|
The Geckles argue whether they should unite with the Munce, so they decide to do a slug race. During the race, Zane cheats by allowing the slug which would make the Geckles meet with the Munce to win. After the race, they immediately head off.
The Ninja, Munce, and Geckles all retreat to the Geckle Strong-Cave. One of the Geckles tries to close the door but was unable. To by time, Lloyd, Kai, Zane, and Jay fight the Awakened Warriors which gives time for Murtessa to force the doors to close. The Ninja fighting head back inside with no other way out.
While Grief-Bringer and the Awakened Warriors are trying to destroy the door, Murtessa and Gluch argue with each other. Nya spots a pile of rocks covering a possible passageway, so she calls everyone to remove the rocks, but it requires teamwork. After they successfully work together, they realize it's a storage room.
Realizing there's is no way out, Gluch apologizes for getting everyone into this mess. Murtessa apologizes and they comment how the two tribes have many things in common. Kai and Nya then declare peace with each other, but the Skull Sorcerer and his army destroy the doors.
The Ninja decide to surrender themselves in exchange for the Munce and Geckles to remain free. The Skull Sorcerer takes the deal and the Ninja are lead out. However, the Skull Sorcerer double-crosses and captures everyone else.
- Its name is a portmanteau of the words "stronghold" and "cave."