'Robotech II: The Sentinels' was supposed to be a sequel to the original Robotech series. Unlike the original series, it was intended to feature only original animation. The series was meant to tell the story of the Pioneer Mission--the further adventures of the heroes of the First Robotech War and their interraction with the coalition of species known as the Sentinels. Animation for three episodes were completed before cancellation, which were adapted into a VHS released film, detailing the wedding of Rick Hunter and Lisa Hayes and the invasion of Tirol by the Invid.