The episode kicks off when SG-1 discovers a massive Mayan-style pyramid on P7X-377. Inside, Daniel Jackson is drawn to a crystal skull that, upon eye contact, emits a blast of "lepton radiation."
Watching the episode, The Crystal Skull, right now. One of my Faves. [S3E21] Crystal Skull
In the end, Nicholas Ballard chooses to stay behind with the aliens—the Omeyocan —to learn their knowledge and friendship, finally validating his life's work. Legacy and Trivia The episode kicks off when SG-1 discovers a
Fans often point out the production still on AppleTV that accidentally shows the skull without its visual effects. In the end, Nicholas Ballard chooses to stay
Since stayed with the giants, do you think he eventually ascended like Daniel, or do you think the SGC should have gone back to check on him?
While the rest of the team thinks Daniel has been vaporized or teleported, he has actually been shifted —he is invisible and intangible to everyone except Teal'c, whose Jaffa symbiote allows him to sense Daniel's presence. The Grandfather Connection
The Omeyocan are "the enemy of my enemy" (the Goa'uld), but surprisingly, they are never seen or mentioned again in the series, leaving a major plot thread dangling for years.