Nothing I've seen or read seems to deal with the Talosians after Kirk allowed Spock to take Pike to them. Has anyone else read or seen anything about them since?
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The Talosians never appear again in the film or TV canon but they do appear in a variety of Trek Books;
B-9 : I was in space for a long time. Then a ship belonging to the Talosians picked me up. They asked me where I came from. I told them people called the Pakleds took me from my homeworld. They are fat
"Aftermath" mentions the desirability of Talosian Windsingers, a form of plant life.
"Being Human" mentions that Starfleet's General Order 7 still forbids travel to Talos IV on pain of execution.
"Burning Desire" has a very extensive account of the Talosian homeworld. The story is quite convoluted but the main thrust is that the Talosians use their advanced telepathy to breach the Federation embargo on visiting their world.
In Cathedral, Cadet Nog mentions that he's visited Talos IV. There's no mention of how he avoided being executed for this.
By 2373, the Talosians became active participants in the so-called Telepathy War with the Dominion. Many Talosians were affected by the Meme Virus, as were many telepathic races within the Federation. Several Jem'Hadar invaded Talos IV, but Omega Squad, led by a telepathic recreation of Christopher Pike, helped repel the invasion.