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This page contains information regarding Star Trek: Strange New Worlds, and thus may contain spoilers.

"He did have a pet sehlat he was fond of [...] sort of...a fat teddy bear."
– Amanda Grayson, 2268 ("Journey to Babel")

I-Chaya was a beloved pet sehlat that Spock had in his boyhood. At that time, I-Chaya was quite old and had belonged to Sarek during his own youth. (TOS: "Journey to Babel")

In 8877 of the Vulcan Calendar (2237), Spock undertook his kahs-wan ordeal prematurely. I-Chaya insisted on following him despite Spock's orders against it. This turned out to be fortunate as a le-matya, a dangerous animal native to Vulcan, attacked Spock and I-Chaya.

I-Chaya fought the creature as best he could, but the old sehlat fell in battle and both he and young Spock had to be saved by the adult Spock, who had travelled into the past to prevent his own death at this moment, posing as young Spock's cousin Selek. Although young Spock managed to find a Vulcan healer to help I-Chaya, the sehlat was beyond meaningful aid when he arrived, which deviated from adult Spock's memories.

Faced with the choice of giving his companion a painful extended existence or a peaceful release from his suffering, Spock logically chose to have I-Chaya euthanized.

Spock's parents had I-Chaya's body brought back from Vulcan's Forge, to be buried in a place of honor on the family grounds. (TAS: "Yesteryear")

In 2259, Spock shared with Christine Chapel his leaning on his bond with I-Chaya during his difficult upbringing on Vulcan. (SNW: "Spock Amok")

At a diplomatic reception aboard the USS Enterprise in 2268, Amanda Grayson mentioned Spock's pet sehlat to his colleagues. She characterized the creature as a "fat teddy bear", much to the amusement of Doctor Leonard McCoy, who had inquired whether young Spock played like ordinary Children while growing up. (TOS: "Journey to Babel")

Background information

I-Chaya was partly based on a cat that D.C. Fontana owned, a feline named Bobby McGee as a reference to the song "Me And Bobby McGee". ("Yesteryear" text commentary) In 1974, Fontana explained, "As to who and what I-Chaya would be as a character, I decided he would be closely patterned on my large cat, Bobby McGee. While Bobby is not old and fat, he has the same affection, snuggle-ability, the fastest claws in the West, and complete disregard for orders. 'One word from me, and he does exactly as he pleases.' The statement fits both Bobby and I-Chaya." (Babel #5; Enterprise Incidents, number 11, p. 27)

The animal is commonly referred to as "Eye-chai-ah" in the final version of "Yesteryear", although the pronunciation that was originally intended is "EE-chai-ah" and "Yesteryear"'s script phonetically spelled the name in that way. The name's pronunciation was changed during recording of the episode's vocals, initiated with an error that the production staff then tried to cover up by changing all readings of the name to "Eye-chai-ah." D.C. Fontana much preferred the original pronunciation, referring to it as the "proper pronunciation" and remarking, "The name – always, forever, and correctly – is 'EE-chi-ah.' The other pronunciation is awkward, 'Lumpy,' lacking smoothness, and unpleasant to the ear. In short, it is not Vulcan." (Babel #5; Enterprise Incidents, number 11, p. 27) By way of clarifying how the sehlat's name was to be pronounced, the novelization of "Yesteryear" (in Star Trek Log 1) commonly spells the name as "Ee-chiya".

In the script of "Yesteryear", I-Chaya was described thus: "This particular sehlat has a brown coat frosted with patches of grizzled beige, and one of his worn, yellow fangs is broken off at the tip, indicating he is aging." The teleplay additionally specified that I-Chaya had been owned by Spock throughout Spock's life.