Stargate

Honestly, the show creators should be ashamed with how they underutilized the Tok'ra. They were given no cultural depth whatsoever. The show alluded to things like "How have the Tok'ra, with all their technology, been fighting the goa'uld for thousands of years and made no progress, but 10 four-man teams under a mountain can do it in their spare time in a few years?" but never actually made any effort to answer them. "We have a plan" became sort of a running joke - the steiner's counterattack of the Tok'ra.

Eventually they had to pivot to intentionally portraying the Tok'ra as arrogant, incompetent assholes because they failed to portray them any other way.

They had so much opportunity to delve into things like the ethics and practical effects of only accepting hosts who essentially have to sign on to dedicating their life to being a member of the alien taliban, or how relationships work, or why the Tok'ra never had any harcesis children, or how they handle the effects of constant host replenishment on their reigning political ideology, or the differences between born-tok'ra and goa'uld converts, or how they envisioned society being after the fall of the empire, or 100 other things.

The tok'ra were wasted (along with the goa'uld to be honest) and it drives me up the wall.