The Enterprise encounters Kukulkan, and it goes about as well as it did when they met Apollo. Only with fewer togas, which is probably for the best. The TOS Rewatch asks, “How Sharper than a Serpent’s Tooth.”
My main source of adoration is that we get the gods-were-really-aliens trope, but it isn’t a god from Europe or North Africa, as is often the default in such tales. The only deities even mentioned in the episode, beyond Kukulkan, are Quetzalcoatl and the dragons of Asian myth.
My main issue, unfortunately, is yet another use of the gods-were-really-aliens trope.