Stargate

Going for a really difficult one now,

I will provide a clue to get you going.
If you can manage, submit your answers with the spoiler tag.
Details available here: https://join-lemmy.org/docs/users/02-media.html

I will grade the winner after at least a few days.

Clue:
What is this address? What's the seventh symbol? Why might it be a big enough deal to show a close up of it? Remember, this is guess the episode, not guess the movie...