The event horizon is a crucial concept in understanding black holes, as it represents the boundary around a black hole beyond which nothing, not even light, can escape.

The podcast episodes discuss the event horizon in the context of explaining what black holes are and what lies within them. For example, Ep. 5: Black Holes from the 'Crash Course Pods: The Universe' podcast and What's inside a black hole? from 'Moment of Um' both focus extensively on the event horizon and its significance.

Additionally, the WARHAMMERISH MOVIES BOOKS & GAMES (Who ripped who off?) | Warhammer 40k Lore episode from 'Adeptus Ridiculous' analyzes how the concept of the event horizon and the dangers of the Immaterium in the Warhammer 40K universe are similar to the premise of the film 'Event Horizon'.