Juukai Sentai Survivorman (translated as Wild Beast Squadron Survivorman) is a fanfictional season of Super Sentai. Its theme is an animal motif. Written by Millennium Ranger (Timothy Compton) and Dragonzeron. This was the first sentai fanfic they ever wrote.
The legend of the Bermuda Triangle is infamous for the disappearance of boats & planes, but the truth lies on the otherside of it. When a cruise boat gets attacked by the natural forces of the Bermuda Triangle, it starts to sink. Only five who have survived from that crash have no memory of who they were before they hit land. A secret tribe on the island told them the story of how they got there & decided to send them on a quest to obtain the survivor powers. A scientist discovered the island & offered to take them home. This allowed the evil organization called TRIBE to expand. When the survivors & the scientist found out about it, they used their powers to become the Survivormen to destroy the evil TRIBE once & for all. Later, with the evil TRIBE getting stronger, it was time for Crystal Beast to enter the fight & help the other Survivormen.
Somehow, the Survivormen's families were not killed but imprisoned inside a dark dimension where they were made slaves to Juugigo. They were saved from his dark prison dimension.