Date not given: The reason for several system malfunctions turns out to be a cloaked Xyrillian vessel with power problems taking a ride in Enterprise's warp field. Trip Tucker transfers to the Xyrillians to help them with repairs, and he befriends the female engineer Ah'Len. After the Xyrillian ship has left, a nipple begins to grow on his arm. Dr. Phlox's surprising diagnosis is that Trip is pregnant. Enterprise discovers the Xyrillian ship, which is now on the tail of a Klingon battlecruiser. The Klingon captain wants to kill the apparent parasites, but Archer and T'Pol manage to convince him to let the Xyrillians go in exchange for their holotechnology. Trip's child is implanted into a Xyrillian male host.

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