Date not given: When the ship's drive is disabled by a polaric field, Trip is injured and falls into a coma. Following Phlox's suggestion, Archer approves of using a Lyserian mimetic symbiont to grow a clone that would stay alive for 15 days, just long enough to provide neural tissue for Trip. Sim, as the clone is called, grows up quickly as expected, but he also inherits Trip's memories and develops a personality of his own. It turns out that Lyserian scientists have been working on an illegal enzyme to prolong a clone's life span, but eventually Sim grudgingly agrees to sacrifice himself for Trip.

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