More Words, Deeper Hole

I began with this summary of the intelligent races and their fates to date in GDW's 2300:

Humans (nearly crashed their civilization with a nuclear war)
Sung (conquered by the Man-Can alliance, IIRC. Human client species, anyway)
Xiang (conquered by the Sung, now presumably a Human client species)
Klaxun (probably a client race of humanity)
Eber (bombed themselves into the stone age, now probably a client species of the Humans... I am beginning to see why the Kafer are so paranoid about us)

Kafers (doing their best to conquer the galaxy; sadly for them, humans can probably conquer the Kafer)
Ylii (enslaved by the Kafer)

Medusae (extinct)
Little Guys (extinct)

Pentapods (slaves of intellects vast and cool and unsympathetic)

AGRA Intelligence (of a level of technological sophistication humans can barely detect, let alone understand)

(Did Bayern find another extinct race?)

Anyway, it looks to me like what happens is if you don't lose space travel by nuking yourself, you probably get to explore until you run into a more powerful civilization that then conquers you. And humans have run into two more powerful civilizations so far.

So...

Humans: pawns in the Great Struggle between the Pentapod's Owners and the AGRA Intelligence!

I see it as a high school based comedy where one of the characters is a Pentapod emulation of a human, and another one is an AGRA Intelligence human meat puppet.

The high school PE teacher is a Kafer!