Warning: SPOILERS forStar Trek: Discovery Season 4's Finale — «Coming Home»
By the end ofStar Trek: Discovery's season 4 finale, the two spore drives used by the USS Discovery and Cleveland Booker's (David Ajala) ship were destroyed, which could signal a return to traditional warp travel in season 5. In «Coming Home,» Captain Michael Burnham (Sonequa Martin-Green) and the USS Discovery's crew came face-to-face with Species 10-C and successfully negotiated the massively powerful aliens to halt the Dark Matter Anomaly's attack on Earth and Ni'Var. While Discovery's monumental First Contact saved the United Federation of Planets, it came at a cost as well: Dr. Ruon Tarka (Shawn Doyle) was killed and the spore drives were lost.
The displacement-activated spore drive isStar Trek: Discovery's great innovation and addition to Star Trek's technology but it was controversial when it was first introduced. Invented, in part, by Commander Paul Stamets (Anthony Rapp), the spore drive allows instantaneous travel via the mycelial network. Essentially, it lets the USS Discovery teleport to a location, which largely eliminated Star Trek's traditional warp travel. But because Star Trek: Discovery seasons 1 and 2 were set a decade before Star Trek: The Original Series, the spore drive was canonically problematic because no other ship in Star Trek had this technology, not even the USS Enterprise. Star Trek: Discovery jumping to the 32nd century in season 3 allowed the series to circumvent its issues with canon, and Discovery found that it was the only ship with a spore drive 930 years later. The spore drive gave Discovery a crucial advantage when the galaxy was completely left without warp travel because of the Burn.
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