'Theta'? Was that what he'd called the Doctor? Jack raised an eyebrow at him at mention of this name. Was that what his name was? He wasn't sure but it sounded less... impressive than he'd figured the Doctor would have.

"I'm fine with just being a passenger," Jack told Koschei, slipping his hands into his pockets. It wasn't as though he'd forgotten everything that the man who wore that face had done. Far from it. With Jack's amazing memory, he wouldn't be forgetting for a long, long time. In fact, the cheerfulness was actually somewhat alarming and concerning. He didn't know how to behave now, and all this talk about 'getting his mind back'.. it set Jack at unease because of how very, very wrong it could go.