BIONICLE: The Secret of the Swarm is a promotional comic booklet that was released at McDonald's restaurants in 2002 alongside the Bohrok Swarms Trading Card Game Happy Meal promotion. It is labeled as part 2 of 3 of "Legends." The short comic starts with a scene where Kongu first encounters the Bohrok. It then briefly introduces the six types of Bohrok and explains the Toa's quest to collect the krana. It ends with the gathered Toa deciding to venture into the Bohrok nest.