6. Will Stamets Forgive Burnham?

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To keep Discovery's spore displacement hub drive safe from Osyraa, Burnham made the difficult but correct choice to eject Lt. Commander Paul Stamets (Anthony Rapp) from the starship, despite his pleas to let him jump the ship back to the Verubin Nebula to rescue his family, Dr. Hugh Culber (Wilson Cruz) and Adira (Blu del Barrio). Stamets was further humiliated when Admiral Vance agreed with Burnham and also forbade Stamets from performing his rescue mission.

Ultimately, Michael saved the day and her friends, but Stamets didn't forgive her by the end of "That Hope Is You, Part 2." In fact, Paul was the lone, unhappy holdout when Michael became Captain Burnham. Will Stamets forgive what he felt was Michael's betrayal and what will his future aboard Discovery be now that he's no longer the sole navigator of the spore drive?

5. How Will Gray Be "Seen"?

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Gray (Ian Alexander) is technically deceased and his consciousness is part of the Tal symbiont inside Adira, but somehow they were able to see Gray, who was tormented by no one else being able to see him. However, thanks to the Kelpien ship's holodeck somehow recognizing Gray and creating a holographic version of the Trill, Culber and Saru were able to see Gray for the first time.

Culber promised to find a way for Gray to be seen permanently, but what will that entail in Star Trek: Discovery season 4? Will Gray be a permanent hologram or can his consciousness somehow be placed in a synthetic body like Jean-Luc Picard (Patrick Stewart) was in Star Trek: Picard season 1? It will be fascinating to see how Gray's dilemma is resolved and to see how both Gray and Adira, the first transgender and non-binary characters in the franchise's history, will play bigger roles in Star Trek: Discovery season 4.

4. Where Are The Klingons And The Borg?

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Star Trek: Discovery season 3 updated fans on the 32nd-century state of the Vulcans, Romulans, Orions, Andorians, and even Bajorans and Cardassians made cameo appearances. But notably absent were the Klingons, who were not mentioned at all. The Klingons were major (and divisive) factors in the first two seasons of Star Trek: Discovery, but fans have had no indication of what became of the warrior race (and what they look like) 930 years later. So many questions surround the Klingons, like what happened to them after The Burn happened, and whether they are still allies of the Federation or became isolationists like United Earth and NiVar.

Meanwhile, the Borg were a big part of Star Trek: Picard and the cybernetic race may remain a purview of that series, but it would still be fascinating to learn what has become of them in the 32nd century. Have the Borg finally been defeated, or have they evolved to no longer be a menace? Did The Burn also affect the Borg? Star Trek: Discovery season 4 needs to provide some answers and hopefully even face one or both of these popular species.

3. Will Tilly Get A Command-Level Promotion?

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The ending of "That Hope Is You, Part 2" indicates that Ensign Sylvia Tilly (Mary Wiseman) will remain as Captain Burnham's Acting First Officer, but she is due for a command-level promotion to Lieutenant if she's going to remain in that role. Although Osyraa's hostile takeover of Discovery exposed the limits of Tilly's command experience, she still conducted herself heroically as Number One. Tilly is a long ways away from being ready for the Captain's chair, but she also can't continue to be the lowest-ranked member of the bridge crew while doubling as First Officer.

2. If Book Is Staying On Discovery, What Happens To His Ship?

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Michael's love affair with Cleveland Booker (David Ajala) was one of the best aspects of Star Trek: Discovery season 3 and the empathic Book found a new purpose aboard Burnham's starship as another navigator for the spore drive. This keeps the couple together, although a civilian like Book being romantically involved with a Federation starship Captain is bound to create issues in Star Trek: Discovery season 4, not to mention how this affects Lt. Paul Stamets' role as spore drive navigator.

However, Book (and his beloved cat Grudge) remaining aboard Discovery likely means he's retiring from his job as a courier, so what happens to Book's shape-shifting starship? Will it continue to remain parked in Discovery's shuttle bay (and take up an enormous amount of space)? Will it be commissioned as a Starfleet ship and put into other use? Book's ship came in very handy during Star Trek: Discovery season 3 but it can't just live aboard Michael's ship permanently, can it?