DOCTOR: Wait a sec. How long ago did you crash land at Chicxulub?

TALBAK: Sixty-six million, three thousand, two hundred and seventy years ago.

(The Doctor and Frida exchanged a glance. Frida couldn’t get her head around such massive numbers, but something about them clearly made sense to the Doctor.)

DOCTOR: You must have been pulled in by the Cyberman freighter that my… that Adric was on. Your asteroid helped bring it all about.