A man came into contact with the other pod, and according to the Doctor, he turned into an alien. CHASE: The hymn of the plants. DOCTOR: Base? DOCTOR: Fanatics? DOCTOR: Who do you work for? I'm certain we're on the verge of a breakthrough. Of course. SARAH: Well, Amelia Ducat (French pronunciation) is only one of the world's leading flower artists. The most dangerous impulse in the universe. We can all relax. We found it in a car boot.
Plan: A: two attempts; Q: How many attempts did the Doctor and Sarah survive to end their lives? A: the plant fanatic; Q: Who ordered the hit on the arctic base? A: the boot; Q: Where was the painting of the rare flower left in the car? A: Chase; Q: Who is trying to encourage the hatching of the Krynoid pod? Summary: Surviving two attempts to end their lives, the Doctor and Sarah seek the identity of the plant fanatic who ordered the hit on the arctic base, pursuing their only lead - a commissioned painting of a rare flower left in the boot of a car. Chase, meanwhile, is doing all he can to encourage the hatching of the Krynoid pod.