PodQuiz 820

This week's rounds are Music (Intros), Turtles and Tortoises, Beatrix Potter Characters (Quickfire), and a round on people called Mark by guest host Kate.
There is no music this week as it is replaced with an extra Prize Round, with the usual prize of a PodQuiz T-shirt! Send your answers for the Prize Round to [email protected].
Prize Round Picture Question:

Which chess piece?