From the same universe the dinosaurs and the scientist came from, they work together to try and solve this mix up without bringing anyone else through, meanwhile Gretal's experiences weren't as so far fetched to be empathise with than she thought.
Gretal is sent to a universe of the Doctor to fix whatever is wrong, at first she thought it was him but then something bigger is threatening to eat the Council alive. Meanwhile, the Doctor reconciles with a kindred spirit.
From the same universe the dinosaurs and the scientist came from, they work together to try and solve this mix up without bringing anyone else through, meanwhile Gretal's experiences weren't as so far fetched to be empathise with than she thought.
Before finding the hole and letting him back into his world, he almost revealed something peculiar but decided to save it for their later and his history.
Gretal is sent into the Tardis, she at first thought it was him the Immortals wanted her to get rid but soon realize that they never make it as easy as it seems
The Peinón are energy eaters that can absorb energy and make it their own, the Immortals thought them not a threat until they were strong enough to eat messengers and soon, Immortals.