The Doctor investigates Clara’s past, finding nothing unusual but discovering that her mother died when she was young. Returning to Clara, she requests that she be taken to see “something awesome”. The Doctor takes her to the Rings of Akhaten, planets orbiting a large planet where the local religion believes life began. The society’s currency is items of sentimental value. Clara runs into a young girl named Merry Gejelh (Emilia Jones), who is about to be sacrificed in the Festival of Offerings, which is to appease the Old God. The Doctor and Clara save Merry and discover that the Old God is really a parasite of memories and sentiment that lives inside the large planet. Clara offers it her treasured leaf that caused her parents to meet, and as she points out that there are infinite possibilities to every choice, she defeats the parasite.