The Bionicle Alliance or simply Bionicle is an alliance of the various factions of the planets of Bara Magna and Aqua Magna formed by Tahu to counter Megatron's Transformers in the Transbio War.
Tahu Confronts Teridax
Tahu, after fighting the Transformers on Cybertron and losing, came to Teridax and submitted to him, forming an alliance to avenge Gali's death. Soon, Piraka Nektann went to Coruscant to ally with General Grievous for fear that Teridax would betray the Bionicle.
Good and Evil Bonds
Soon, the alliance ended. The United Villages joined the Autobots and the Makuta joined the Decepticons.