George Takei, who played Lt. Hikaru Sulu in the original “Star Trek” series, called Stewart on threads “a true and irreplaceable legend.” 

“He inspired a whole next generation of star-gazers who looked longingly ahead to a brighter future for all humanity,” Takei said.

Stewart’s “Star Trek: The Next Generation” co-stars Wil Wheaton, who played Wesley Crusher on the series, and Jonathan Scott Frakes, who played William Riker, also shared tributes to the late actor. 

“Godspeed, Captain,” Wheaton wrote in a message on Instagram, alongside a photo of himself with Stewart.

“Rest in peace, my friend,” Frakes wrote.

Rebecca Romijn, who like Stewart has played roles in both the “Star Trek” and “X-Men” franchises said in a video posted on social media: “I feel so grateful to have known him for the last 25 years, and to have been in his orbit … both as a fellow mutant and as a fellow member of Starfleet.”

“He was positively delicious, hilarious, naughty, incredible sense of humor, and that booming voice of his that always spoke to the very back of the room, as every classically trained Shakespearean great needs to master, has always been an inspiration,” she said. “I send my condolences to his family, and I’ll miss my friend dearly. Rest in peace, Patrick.”