Warning: SPOILERS ahead for Star Trek: Picard season 1.
One of Star Trek: The Next Generation sequel series. Commodore Oh being a Vulcan/Romulan mutt is a fascinating follow-up to Saavik.
Introduced in Star Trek II: The Wrath of Khan, Lt. Saavik was the prized pupil of Khan (Ricardo Montalban) over the Genesis Device - which resulted in Spock's death in order to save the Enterprise from destruction. Saavik's Romulan side allowed her to cry at Spock's funeral before his corpse was photon torpedoed into the newly-formed Genesis planet. In the sequel, Star Trek III: The Search for Spock, Saavik (now played by Robin Curtis) ed Kirk's scientist son David Marcus (Merritt Butrick) to investigate the Genesis planet, where they found Spock resurrected as a child. As Spock rapidly aged to adulthood, Saavik ed the suffering Vulcan as his mate when he underwent his Pon Farr sexual awakening. After Spock was reunited with his katra - his Vulcan soul - and became whole again, Saavik stayed behind on Vulcan while Kirk led the Enterprise crew on a new mission to save the Earth in Star Trek IV: The Voyage Home. Saavik wasn't seen again in Star Trek canon.
In Star Trek: Picard, Acting Captain Will Riker (Jonathan Frakes), the Romulans were foiled and Oh's treachery was finally exposed.
As a Vulcan/Romulan crossbreed, Oh emerges as the opposite to the heroic Saavik. The villain actually has more in common with Star Trek VI: The Undiscovered Country's Lieutenant Valeris (Kim Cattrall). A full Vulcan and the first to graduate at the top of her class at Starfleet Academy, Valeris was also Spock's protege. But Valeris conspired with Klingon, Federation, and Romulan dissidents to frame Kirk for the murder of Klingon High Chancellor Gorkon (David Warner) because they feared a future of peace between the Klingons and the Federation. Savvy detective work by Kirk and Spock uncovered Valeris' treachery and Spock was uniquely hurt and furious by his pupil's betrayal. Valeris was apprehended at the end of Star Trek VI, but perhaps her devious acts were an inspiration to Commodore Oh nearly a century later.
Vulcans and Romulans were established as originally one species that splintered thousands of years ago, hence the shared pointy ears. However, back in 1982, Star Trek creator Commodore Oh in Star Trek: Picard.
Star Trek: Picard is available to stream on CBS All-Access and internationally on Amazon Prime Video.