Power Rangers Ninja Storm2003

Tori:
The Mountain of Lost Ninjas.

Cam:
Of course.

Dustin:
Oh, that's where all those freaky ninja ghost dudes are, right?

Cam:
So you DO study your ninja history.

Dustin:
Yes, sometimes.

Cam:
Then you should know that the Mountain of Lost Ninjas is where the Cavern of Spirits is...

Tori:
...which houses the Gem of Souls. It's the only thing on Earth that's powerful enough to break the energy sphere surrounding Sensei.

Cam:
That's gotta be what the Thunders are after.

Shane:
Then that's where we're going.