[s0e13] Planet Of The Dead Direct

"It's the planet San Helios," the Doctor replied, tasting the air. "Or what’s left of it. High-grade silica, zero moisture, and a sun that’s trying to cook us like Sunday roasts. We need to get everyone back inside that bus."

The Doctor stepped off the bus, looking back at the shimmering air as the rift snapped shut. He had saved the world again, but as he watched Christina being led away by the police (only to make a daring escape using a jetpack), his expression saddened. [S0E13] Planet of the Dead

: It introduces the prophecy of the Doctor’s "song ending," setting the stage for his eventual regeneration. "It's the planet San Helios," the Doctor replied,