Alex arrives to reclaim his place as the Red Ranger, in an effort to ensure history is put back on its correct course. He warns Wes that his father, recently injured by Ransik, will die within the day, and that he must take his place as head of Bio-Lab. The four Time Force officers from the future are shocked by Alex's new, far crueler and colder attitude towards them, especially his fiancee Jen. The target of his return is Frax, who has created a giant robot known as Dragontron! (thetvdb.com)