The name given to the mimetic simbiot born of a Lyssarian desert larvae from Tucker's DNA in order to grow into his form and provide organs to save the mortally injured human officer. As with all simbiots, Sim-Trip grows at a vastly accelerated rate in a matter of days—so much so that his eventual, quick death comes as an emotional blow to the crew, especially Archer and T'Pol; he carries Tucker's memories and confides his attraction to the Vulcan. When he dies, Sim is given a memorial service with full Starfleet honors and is ejected into space in a torpedo tube, per custom.