The blue crystal that the Doctor took from Metebelis 3 in a previous adventure (The Green Death) is desperately sought by the Eight Legs, a race of super mutated spiders, as the final ingredient in their plan for transforming the Great One into the Supreme Being.

With help from an old mentor, the Doctor realizes the only way to foil the spiders is to face his fears and make the ultimate sacrifice. The Doctor must risk death to return to the cave of the Great One and save the universe.

You can find the “Summons From Gallifrey” podcast on Apple, Spotify, wherever you listen to your podcasts, and regularly here on my YouTube channel for the visual side of things.