Our son turned on this story in a big, bad way! Episode three ends with the third Doctor battling a weird, pig-faced man in a black void, the representation of the dark side of their enemy’s will. It doesn’t look like he’s winning this fight; in fact, Jon Pertwee and his stunt double are getting slammed all over the room.
And our son took this as a very, very grim turn of events. He loved the comedy stylings of the Brigadier earlier, bellowing at the Doctor for transporting UNIT headquarters to some “deserted beach,” and sat riveted to the story, but the Doctor losing this fight wasn’t fun. Hopefully he’ll make it out of this mess for the final episode!