Some people just violently hate this story and I've never really understood that. Sure, the science is ridiculous, but it's Doctor Who, whatever. It's not the best story, but it builds up to the Doctor and Clara having one of the most explosive confrontations between companion and Doctor ever. This is halfway through Clara's time in the TARDIS, and this story is a huge turning point for her character that leads to a deeper connection with the Doctor. Also, the moon hatching is filled with the appropriate sense of wonder, so that's neat.