When the other Titans start listening to heavy metal music, Robin warns them of the dangers.
This episode contains examples of:
- Awesome, but Impractical: The Throne of Bones which replaces the couch is this. Not only is it high, but also uncomfortable.
- Evil Costume Switch: After the Titans go to a metal concert by accident, all except Robin have new costumes showing their devotion to it.
- Heavy Mithril: The Metal World is this in spades.
- Jazz: The Titans think they're going to a jazz concert, only to reveal that it was at the day after the metal concert. It's also how Robin defeats the Metal Lord.
- Metalhead: The Titans turn into these except Robin until the finale.
- No Indoor Voice: The Titans shout every line after they become metal.
- Prehensile Hair: Metal!Robin uses this to pull himself out of the mosh pit.
- Rock Me, Asmodeus!: The Metal Lord is this in spades, even beating the Titans in a rock off.
- What Are Records?: Robin explains in detail what records are and how they're played when the Titans have no clue what he's talking about.
