The Lost Island

Plot:

Season 5 episode 16 The Lost Island is actually two episodes, part 1 and part 2. In part 1: the OSI agency loses one of its satellites, which crashes on a remote ocean island, and is now cracked and leaking neutron radiation which is negatively affecting the other-worldly humanoids that inhabit the island and electromagnetically cloak it in invisibility. A decision is made by the aliens to send Da Nay, a young alien woman, to the U.S. to find and bring back a serum that will boost the aliens' immunity and thus allow all the aliens to leave the island and survive with ...