This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
Adira once made a quilt of special memories they shared with Gray as a gift, including a time they broke the replicator causing it to repeatedly produce apples, and a time they played "imaginary chess." (DIS: "Forget Me Not")
In the 3180s, Gray was joined to the Trill symbiont Tal. (DIS: "Forget Me Not") Soon after, Gray took up the cello, influenced by his past host Kasha Tal. (DIS: "Scavengers") Gray displayed a number of other musical instruments (including a sarangi, an esraj, a dulcimer, and a tamburica with a bow) on the walls of his quarters. (DIS: "Forget Me Not")
Not long after joining, in 3188, an asteroid collided with the ship Gray and Adira were on, fatally injuring Gray. The Tal symbiont survived and was implanted into Adira. Since Adira was Human, they briefly lost all their memories of their life before joining, including those of Gray. Once Adira regained their memories in 3189 and, in addition, those from the Tal symbiont, Gray began to appear to them as a seemingly independent entity with whom they could interact. (DIS: "Forget Me Not")
Appearing to Adira
Gray later appeared to Adira aboard the USS Discovery while Adira was working in engineering, and later in the mess hall, indicating that Adira needed to make more friends on the ship. When Lieutenant Commander Paul Stamets commented that it looked like Adira was talking to themself, Adira opened up to him about the unexpected way they were still able to interact with Gray's "soul," prompting Stamets to show his support, and Gray to note: "I like this guy." (DIS: "Scavengers")
After not having appeared to Adira for days, Gray returned during Philippa Georgiou's memorial service, apologizing to Adira and noting his regret that he could no longer interact with the world. Gray later offered suggestions to Adira while they tried to repair Discovery's shields. (DIS: "Su'Kal")
When Adira travelled to the dilithium planet, the holographic environment aboard the KSF Khi'eth detected the presence of Gray and made him visible to Saru and Hugh Culber, albeit in the form of a Vulcan. While there, he took advantage of his non-corporeal form to scout into the high-radiation area of the ship beyond the holographic environment and reported that the ship was disintegrating. As Su'Kal prepared to deactivate the holographic environment, Gray was distraught that he would lose his visible form, saying that both he and the Tal symbiont were "stuck." At this, Dr. Culber promised that the crew would find a way to allow him to manifest visibly on an ongoing basis. (DIS: "That Hope Is You, Part 2")
|The hosts of Tal|
|Kasha • Jovar • Madela • Cara • Senna • Gray • Adira|
Gray Tal was portrayed by Ian Alexander.
In an interview with Michelle Paradise, she stated that Gray's storyline will be followed up in season 4 and "That storyline is incredibly important to us."  She expanded on that in a separate interview stating "Representation matters. It matters to see a version of yourself on screen. It matters there are non-binary and transgender characters. It matters that there is a Black woman in the captain's chair. It matters that there is a gay couple on our show. We will continue to do that for the show, and the world we live in, but also, to honor the Star Trek legacy. And to be super clear, we will pay that moment off in Season 4. Gray will be seen. That promise will be paid off."