"If he's so bloated from the desires of the season, he might not be able to move," the Doctor said. "Might be far too heavy under the weight."

If he'd been alone, he probably would've said that it served the creature right, stuffing itself on the needs of the human race, even if it wasn't hurting anyone. Didn't it know better?

But the Doctor's arm was on Jo, and she wouldn't want that. She just wanted to help.

"I can get him home," he said. "But I'll need you to help me."