Li'l Sebastian first appears in "Harvest Festival." Jerry is watching over Li’l Sebastian during the Harvest Festival and responsible for his care, saying that they are "Glucotrol buddies," referring to the fact that he and the horse take the same diabetes medication. Tom Haverford is also responsible for Li’l Sebastian and uses Li'l Sebastian as a marketing ploy for the Snakehole Lounge and later loses him when the gate is left open. Parks employees ultimately find him in the festival's Corn Maze from the view on top of the Ferris Wheel. During the search, Ron claims that Li'l Sebastian could not have gotten far, due to the fact that "he has the legs of Tom, the endurance of Jerry, and the diseases of Jerry."
Li'l Sebastian passes away in "Li'l Sebastian." The Parks Department holds a lavish memorial service for him.
A hologram of Li'l Sebastian appears in "Moving Up (Part 2)" during the finale of the Unity Concert.
Li'l Sebastian Obituary by Leslie Knope
He was an animal, a legend, a friend. He was our beacon of light. He was Pawnee's horse. In what is surely the most monumental news to come out of Pawnee since the eradication of smallpox in 1993, it is with sorrow that we report Li'l Sebastian is dead. But he will never leave our hearts and our memories.
Sebastian may have been li'l, but his impact on this town, and the Parks Department, was anything but li'l. When his owners, Michael and Elizabeth Stone, first discovered him, Elizabeth says it was "like seeing an angel and being punched in the gut at the same time - because as perfect as he was, we knew we'd never see anything that perfect again." Michael goes on to say, "I love my wife, I do. But I LOVED Li'l Sebastian."
Li'l Sebastian spent his years out in the field, changing the world. He was a goodwill ambassador for Indiana Veterans and went to Kuwait to entertain the troops. A champion climber, he was a member of the Great Lakes Ski Patrol and Emergency Rescue Team, serving as its captain from 1996-98. He participated in the celebrations for Queen Elizabeth Lil's Golden Jubilee, even marching in front of Buckingham Palace. (Speaking of marching, that wonderful tiny horse trotted in every single Pawnee Independence Parade from 1987 on - except for 2003, when an ankle injury kept him sidelined. Though with no fewer than four floats in his honor, it sure felt like he was there!) And who can forget when he received his honorary degree from Notre Dame University? That's Dr. Li'l Sebastian to you!
And then there was his lengthy relationship Li'l Agnes. The two met at a fund-raiser for then-Senator Evan Bayh, and for two years, they were inseparable, until, for reasons we still do not know, she soured on him. His heartbreak was palpable, leading to a six-month sabbatical from the public eye. But after a while, he got back on the horse(s). You know the names - Li'l Zelda, Li'l Jasmine, Li'l Courtney, and a brief weekend encounter with Big Jim - but sadly, he never married again.
In his final days, Li'l Sebastian was still entertaining boys and girls of all ages. What a workhorse! Despite being 25 years old, having cataracts in both eyes and severe arthritis, he was out there, with all of us, spreading joy and cheer. And now he, too, has left this earth.
His legacy will live on. He sired over 200 mini-horse children, ensuring that future generations of Pawneeans, Americans and citizens of the world will continue laughing and sharing the joy of the Sebastian line.
Li'l Sebastian, we miss you. But we know you are in heaven, looking down on us, doing your two favorite things: eating carrots and urinating freely.
So gallop on, Li'l Sebastian, in that big horsey ring in the sky.