While gatecrashing some fancy event on an alien planet, you were detained by security. The strange bipedal axolotl creatures injected you and the Doctor with a strange formula they claimed to be a truth serum.

You didn't feel any different. For a moment you're relieved that the serum doesn't work. Your peace of mind is shattered into fragments as the Docto begins spouting information about the TARDIS and how it works.

After a very long night, the fish release you having determined that the two of you aren't a threat. Which would be lovely, if not for the still truth spouting timelord returning to the TARDIS with you.