A mysterious interstellar state whose border was guarded by Balok and his enormous flagship Fesarius, and which tested the intentions of the Enterprise before agreeing to an exchange of envoys.
The First Federation is a spacefaring power encountered by the USS Enterprise in the Original Series episode The Corbomite Maneuver. Its territory is marked by spinning cube-shaped buoys, one of which blocks the ship's path and has to be destroyed.
The Enterprise is then confronted by the Fesarius, a vast spherical vessel commanded by Balok, who condemns the crew to death. Kirk bluffs that his ship carries corbomite, a substance that reflects any attack back on the attacker. When Balok's small pilot vessel appears to be in distress, Kirk goes to its aid.
Balok proves to be a small, childlike being who had used a fearsome puppet as his public face. He welcomes the humans with a drink called tranya, and Lieutenant Bailey stays behind as a cultural envoy.