An unidentified space capsule is tracked from deep space, entering the atmosphere to crash-land in the Arctic. Scarlet and Blue discover that the capsule is from the Endeavor II, a manned mission to Jupiter which disappeared fifteen years ago. Inside, two members of the three-man crew lie dead in their cryogenic tubes, but the third is miraculously still alive and revealed to be Commander Lewis - Lieutenant Green's father! Revived on Skybase and cleared by Dr. Gold's DNA test, Lewis is reunited with his daughter who offers to accompany him to the Space Agency in New Mexico. Then Scarlet learns that Dr. Gold had unwittingly performed the DNA test on himself, and the man being escorted to the Space Agency is a Mysteron replicant...