 Luke and Helena prove to be a dangerous pair and in one of her most nefarious acts, Helena along with Luke plans to blow up the Cassadine yacht with many Port Charles residents aboard.Their plan fails, and Luke is put into a mental hospital while Nikolas bans Helena to banishment in the Cassadine compound once again, this time apparently for good.Several months go by, and after Luke discovers the reasons for his D.I.D.