This post will be pretty short, because I had no idea what was going on.
Suddenly, everyone in the TARDIS seems to be acting strangely! Susan attacks Ian with a knife, Ian and Barbara are very irritable, and the Doctor thinks that his human companions have caused all the trouble. When, in all actuality, it was the TARDIS warning them that it was about to go to the beginning of time, or something. Yeah, it doesn’t really make a lot of sense. But once the Doctor saves the day, he realizes that Ian and Barbara are actually decent people to have aboard his ship, and instead of trying to ditch them he genuinely attempts to make it back to 1960s Earth.
This serial is only two episodes long, making it the shortest yet. It also takes place entirely inside the TARDIS, giving it a confined feel. Which is pretty neat. But I still had no idea what was going on, and that pretty much spoiled it for me.
Next time, it’s the first of the lost episodes–an entire serial gone missing–Marco Polo.