InStar Trek: Discovery season 4, Lt. Sylvia Tilly (Mary Wiseman) and Cleveland «Book» Booker (David Ajala) find themselves supporting the USS Discovery's new Captain, Michael Burnham (Sonequa Martin-Green) as they face a new threat to the galaxy. But both Tilly and Book undergo their own personal challenges in Star Trek: Discovery season 4 that will evolve their unique characters even further.
Related: Star Trek: Why Tilly & Burnham Are Discovery's Best Friendship
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