Although at times it's quite eerily claustrophobic, this isn't the best story for the Time Lord. It actually starts as if bits of it are missing. We find the four already trapped in the TARDIS with everyone behaving erratically. It's almost like they've never met - there's certainly not much trust to be seen. Their time machine won't work and the "Doctor" (William Hartnell) has been hit on the head. "Barbara" (Jacqueline Hill), "Susan" (Carole Ann Ford) and "Ian" (William Chesteron) must try to stop squabbling, violently at times, long enough to piece together the mystery. Could it actually be ...