The gang must traverse a series of traps leading to Nibiru's crystal sarcophagus.
The episode provides examples of:
- 2D Visuals, 3D Effects: The Rock Monster is CGI.
- Break Them by Talking: When the gang finally reaches the sarcophagus, the Evil Entity attempts this, declaring that they are destined to set it free and revealing that they are merely the latest in a long line of mystery-solving groups that it has manipulated into coming together, all for the purpose of releasing it. It stuns them for a few moments, before Daphne retorts with a Shut Up, Hannibal!.Evil Entity: Destroy me? Never. You have no choice. This is your destiny. Everything you have done, you have done for me. I brought you together as I brought all those together before you. I made you into friends. Forced you into a group. I am the author of your every hope and dream. All to this purpose- you set me free.
- Death Seeker: By this point, Ricky is firmly convinced none of them are going to survive the Nibiru event... and he's looking forward to it.
- Elemental Powers: The keys are tied to the classical Western Elements: Air, Earth, Water and Fire.
- Family-Unfriendly Death: Hot Dog Water's Sound-Only Death where she is brutally shot by Professor Pericles's robots. Even though it's off-screen, it's still very brutal for a Scooby-Doo series.
- Floating Continent: The Air Dimension
- Fold-Spindle Mutilation: Two of Pericles's robots meet this end thanks to the Air Gate's trap. Daphne would have, but Fred uses the Fourth Key to defuse the suction trap in the nick of time.
- Platonic Declaration of Love: After expressing her love for Fred, Daphne tells the rest of the gang that she loves them and they are her best friends, despite the Evil Entity trying to convince them otherwise.
- Sadistic Choice: Pericles again issues an ultimatum: come out of hiding or Hot Dog Water dies.
- Serious Business: End of the world nothing, Shaggy and Scooby are down to their last hamburger!
- Shoot Out the Lock: Shaggy assumes this is how the first key is supposed to be used. But it fails since, the flint part of the gun is the actual key, not the gun it was attached to.
- Shut Up, Hannibal!: Daphne responds to the Evil Entity's Break Them by Talking attempt with this, insisting that even if the entity did bring them together and manipulate their fates, her love for Fred and her bonds with the others are real - even if the Entity was responsible for bringing them together, the friendship between the members of the gang is entirely their own. They all realize she's right and regain their Heroic Resolve.
- Sound-Only Death: Hot Dog Water is killed by German robots. This is noted when as the gang crosses the bridge, gunfire is faintly heard and Scooby turns and whimpers. When he does, Velma knows it as well.
- Stealth Insult:Brad: This dark cavern is doing wonders for your complexion, Judy!
- Took a Level in Badass: Hot Dog Water
- You Monster!: When Pericles orders Hot Dog Water to put him down, she responds "Not a chance you nasty little monster".
- You're Insane!: Ricky calls Brad, Judy and Pericles insane.
- Evil Entity: The time of Nibiru has come.
