The Lord of the Rings - Radio Drama | The Black Riders (Episode 2)

E02. Covering "The Fellowship of the Ring" Book 1 - Chapter 3-9-10*:

Frodo, Sam and Pippin set out through the South Farthing of the Shire towards Buckland, and encounter a black rider. The hobbits are pursued by deadly Black Riders. The hobbits try to rest in an inn, but Frodo 'accidentally' puts on the Ring, making him invisible. Strider who had at first seemed menacing, turns out to be friendly. The innkeeper, Butterbur, gives Frodo a letter from Gandalf, which tells him that Strider is a friend of Gandalf's whose real name is Aragorn.

*1.4–1.8 on Crickhollow, Fatty Bolger, the Old Forest, Barrow-wights and Tom Bombadil omitted.
https://tolkiengateway.net/wiki/The_Fellowship_of_the_Ring