Getting additional companions for Sith Inquisitors.

Was wondering...

Does anyone know how or when you acquire the following companions:
Andronikus Revel
Ashara Zavros
Talos Drellik
Xalek

I'm a level 29 Sith Inquisitor and all I have is Khem Val still. I'm wondering if maybe I missed something or if I just haven't gone far enough in the story to get my new companions.

Any feedback would be awesome.

Are you skipping your class quests? All of your companions come from your class quests on each planet.

You shouldn't skip any planets, or at the very least, don't skip your class quests on those planets.

Andronikos Revel - lvl ~24 class quest on Tatooine, maybe earlier if you skipped the Balmorra Bonus Series for whatever reason.

Ashara Zavros - bare minimum lvl 31/32 if someone helps you do the class quests, or normally around lvl 35 if you took the time to do the Nar Shaddaa Bonus Series

Talos Drellik - about halfway thru your class quests on Hoth (lvl~38/39)

Xalek - late 40s class quest, probably lvl ~48 (only one I haven't gotten to yet cuz I quit my ghost-town server and re-rolled) .

Don't know how you managed to reach level 29 without doing any class quests on Tatooine... cuz you meet Andro right away, and I believe it's the second quest that he comes with you as a Guest companion.

TOR is actually very forgiving if you solo only regular missions and class missions. I skip all the Flash Points and Heroics (my guild is all 35+ and I want to catch up) but I definitely stick around each planet for the bonus series. If you're in it for the PVP you should really hold off until 30 to start as you'll have all of your classes' abilities for the most part and you'll have a tank or ranged DPS companion to pick from.

Also, the class mission story line is pretty darn amazing. I've heard other classes have more interesting ones but I'm liking the SI-Sorc one so far.