StoryReturn to Mysterious Island 2 picks up directly where the first game left off, Mina is escaping the Island with her faithful monkey pal Jep. However, when the game starts, instead of escaping, the helicopter crashes and both Mina and Jep are stuck on the Island once again.
The energy shields that were surrounding the island are still down, but all of the plant and animal life begins to decay. Upon finding the ruins of an unknown civilization, she learns that the cause of the decay is pollution from the outside world. Mina knows what she must do... turn the shields back on. However, if she does, she will give up all hope of ever escaping the island, and returning to civilization.