Robotech II: The Sentinels was an attempt by Harmony Gold USA to continue the original 1985 Robotech television series. Only three episodes were ultimately animated before the project was canceled in 1986, and a feature-length film was released from footage taken from the completed episodes. The aborted 65-episode Sentinels series would have followed the ongoing adventures of Rick Hunter and Lisa Hayes and the rest of the Robotech Expeditionary Force (REF) during the events of The Robotech Masters and The New Generation series.