I haven't been able to find one, and I hoped you fine people could help. Something like this Where can I quickly check if a given X-Files episode is a MOTW or arc episode? but for Stargate would be great. I'm not looking for a viewing order, just which episodes relate to the main story. Thanks.
Here's the ones identified on the Stargate wikia:
Each one has -tons- of episodes, so it'd be quite difficult to copy the list here, but here's links to the individual arcs listed there:
- Athosians (18 episodes)
- Asurans (15 episodes)
- Ascension (5 episodes)
- Genii (12 episodes)
- Lucian Alliance (12 episodes)
- Ori (20 episodes + 1 movie)
- Sha're (5 episodes)
- Skaara (5 episodes)
- Goa'uld (80 episodes + 2 movies)
- Replicators (10 episodes + 1 movie)
- Tok'ra (35 episodes + 1 movie)
Sub-arcs, like "All the Anubis-related episodes", are not listed here. However, if you do want character arcs, they can be found through the same site. For example, on the page for Anubis is a link in the sidebar that lists all his appearances.