Fissure Quest
Summary
William Boimler, a clone of Brad created in a transporter accident, captains the starship Anaximander on a mission to find and stop the source of the recent interdimensional rifts which threaten the multiverse. His crew includes alternate-reality versions of characters from other Star Trek series, including multiple copies of Ensign Harry Kim, and picks up an alternate Mariner who is an engineer. Mariner devises a way to track the vessel creating the rifts. Its captain is an alternate Lily Sloane (the co-inventor of warp drive), who instead invented interdimensional travel; the rifts are an unintended side effect of her vessel. Sloane agrees to help return the interdimensional crew home.
Summary from Wikipedia, CC BY-SA 4.0.
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