Following the alignment of the planets of the Solar System, strange tremors and weather start to rock the world. The Turtles are led back underground in their investigations, only to find the underground city once again booming with life. But the people of the underground city are not friendly, and their actions could spell disaster for millions of humans.
This episode provides examples of
- Atlantis: Or Y'lyntis, as it's called here. The Turtles comment on this.
- Beneath the Earth: The Y'lyntian colony
- Bittersweet Ending: Versallia's aid to the Turtles has saved the world, but at the cost of destroying what's left of her civilization. However, Versallia has heard rumors of other Y'lyntians managing to escape the city and intends to find them.
- Call-Back: The green men were originally humans mutated by the Y'lyntians.
- Convection, Schmonvection
- Drives Like Crazy: Mikey's an even worse driver than Don used to be.
- Flashback: Versallia shows the Turtles a recording of the rise and fall of Y'lyntis.
- Foreshadowing: The other two mutated forms shown in the flashback are Merpeople and Avians.
- Genre Savvy: Mikey doesn't know why they keep returning to Y'lyntis, considering how badly it goes for them each time.
- I Lied: The Turtles meet the High Mage, aka the Entity again. He reveals he was not entirely honest about his situation before.High Mage: After ten thousand years, a new day is dawning for my people. The Y'lyntians shall rule once more.
Leo: Your people? You told us you were the sole survivor of your kind, that you were peace-loving. Why all the lies?
High Mage: At the time I had limited power. I needed your help to maintain my city, so I said what I had to. - Magma Man: The Lava Wraiths.
- Not-So-Well-Intentioned Extremist: Turns out the High Mage was lying about the Y'lyntians being a peaceful race and him being the sole-survivor.
- Power Glows: The Crystals, in particular the Crystal Moon. Also the Y'lyntians' energy beams.
- Pluto Is Expendable: Mikey eats the donut representing the Earth and gets scolded by his brothers for goofing around instead of listening to Don. He later eats the donut representing Pluto.Mike: What? It's Pluto. Who cares about Pluto?
- Shout-Out: Versallia tells the Turtles: "Come with me if you want to live"
- The Snack Is More Interesting: In the beginning, a planetary alignment takes place, which Don demonstrates with donuts and a grapefruit, only to see Mike has eaten the donut representing Earth. He later also eats the one representing Pluto and justifies it by saying that no one cares about Pluto.Don: It's really quite simple to understand. The longitudinal span of the other eight planets, the Moon, and the Sun, collimate within a geocentric sector of fourteen degrees to form a grand planetary alignment with Earth. Say this grapefruit is the sun, right? And the Earth is the third donut from the— Hey, what happened to Earth?
(Mike is chomping on the donut)
Mike: What?
Raph: Shell for brains! - The Smurfette Principle: Versallia seems to be the only female Y'lyntian of note.
- We Need a Distraction: The three Turtles distract the evil Y'lynthians long enough for Leonardo to foil their plan.
- When the Planets Align: What helps recharge the Crystals.
