Jo wasn't sure if she should trust him, given that he'd lied to her. But then he had admitted it at least and it wasn't as if she would be able to get the creature home herself. She could contact UNIT, but they didn't have any spaceships - at least not that she knew of.

"Alright," she said in the end. "But I'll be keeping an eye on you," she warned, and started walking again.