Bohrok is a subtheme of Bionicle introduced in 2002 and currently consists of 6 sets. All sets were released in 2002. As of today, the average annual growth of sets in Bionicle Bohrok is approximately 7.3% per year.
The Bohrok are mechanical BIONICLE insectoid creatures and prominent antagonists in the Chronicles storyline controlled by strange parasitic beings that live within their heads, known as Krana. All Bohrok share the abilities of curling up into a ball and ejecting their Krana onto an opponent, forcing them to become part of the swarm and are equipped with shields on their hands that allow them to fire their element.