The mystical island of Voya Nui has been taken over by vicious Piraka. They have stolen the all-powerful "Mask of Life" enslaving all the inhabitants of the island, providing the dreadful rulers with huge armies of obeying Bionicle creatures. Things of curse can't stay this way. The island needs a hero and that's you. Take control over the Toa Inika and restore the balance of the region. Make good use of the unique abilities of the six Toa and... well, destroy the bad guys of course!
BIONICLE HEROES brings to life the most powerful and exciting LEGO characters ever seen
in one game, in an action-packed world of adventure and discovery. Take control of a young hero as he steps out of the real world and into the strange and dangerous universe of BIONICLE. Only by mastering the powers and special abilities of the greatest BIONICLE heroes will he be able to overcome the many challenges ahead.
Players control an anonymous hero out to stop the evil Piraka, who have used the power of the Mask of Life to transform the wildlife of the island of Voya Nui into aggressive, evil creatures. The character is able to wear the masks of the Toa Inika in order to take on their appearances and powers. Players can switch between any collected masks at will, but if they run out of health the current mask is lost and a new one must be found before the character can become that Toa again. Collecting a mask also restores health, even if it is one the character already has. (Wikipedia)