1 Head Death: Ah, Living For Over 900 Years, sit down.
1 Death of Insanely Overpowered Fireballs: Yes, sir.
2 Head Death: So, did you collect the Allosaurus?
2 Death of Insanely Overpowered Fireballs: No, sir.
3 Death of Insanely Overpowered Fireballs: I couldn't even get near him.
3 Head Death: Why not?
4 Death of Insanely Overpowered Fireballs: He was being protected by members of the Secret Saurus!

Mmmm... dinosaurs in dark suits and sunglasses, with earpieces.

Just stop for a minute and visualise that image.

The best candidate for the Secret Saurus would be the genus Cryptosaurus ("hidden lizard"), a type of ankylosaur first described by Seeley in 1869. It remains very secret and hidden to this day, as the entire genus is known only from a single femur bone. The genus was renamed Cryptodraco ("hidden dragon") by Lydekker in 1889, when he thought that Cryptosaurus had already been assigned to a genus of lizard, but this was a mistake caused by a typo, so the name Cryptosaurus was reinstated. Clearly some sort of cover-up was at work.

There's also Cryptoclidus, a genus of plesiosaur, which was also first described by Seeley, in 1892. Coincidence?? I think not...

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2013-11-16 Rerun commentary: You know, I think there's a whole TV series concept here. Not the Secret Saurus (although that would make a great series), but an historical mystery series built around rival palaeontologists and their steampunk exploits in racing to outdo one another in finding and naming fossils.