Continuing on where the previous story left off, All the Weyrs of Pern opens with AIVAS - the Artificial Intelligence Voice-Activated System; reactivated when the solar panels on the Admin Building were unearthed - finishing its recital of the early history of Pern. Following this, it reveals it has access to the data banks brought by the original colonists, and has a plan to remove the threat of Thread once and for all.