In this two-hour episode (split into two parts for syndication), the OSI agency loses one of its satellites, which crashes on a remote ocean island. Now cracked, and leaking neutron radiation, which is negatively affecting the other-worldly humanoids that inhabit the island. 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 of the aliens to leave the island and survive with the human population. Da Nay obtains the serum and returns to the island, where Steve Austin has found a way in past the protective barriers.