Theodore Donald "Donny" Kerabatsos

Theodore Donald "Donny" Kerabatsos is the placeholder name of a male Earth pony who appears in the episodes The Cutie Pox, Leap of Faith, and Slice of Life, and in the IDW comics. He has a pale yellow coat, dark brown mane and tail, orange eyes, and a cutie mark of a bowling ball and two bowling pins.

Development and design
Donny is one of four ponies based on characters from The Big Lebowski: himself, based on the character of the same name (played by Steve Buscemi); Jeff Letrotski, based on and named after Jeff "The Dude" Lebowski; Walter, based on and named after Walter Sobchak; and Jesús Pezuña, based on and named after Jesus Quintana.

Meghan McCarthy stated on the homage to The Big Lebowski and easter eggs in the show, "Very rarely are those things written into the script, but then when it goes to Studio B and the board artists and Jayson Thiessen, supervising director, I think they have a lot of fun. They have to populate this world with these background ponies and they’re like ‘oh, they’re at a bowling alley, eh?’" A fan's thought that the bowler stallions' inclusion in The Cutie Pox "was just the animators amusing themselves, rather than a sop to the adult audience" has been agreed to by Jayson Thiessen. Tim Stuby "had nothing to do with Lebowski" ponies.

Season two
Donny appears alongside Jeff Letrotski and Walter at the beginning of The Cutie Pox. At the Ponyville bowling alley, he dodges Scootaloo's bowling ball as it careens across the building.

Season four
In Leap of Faith, Donny attends Flim and Flam's presentation about their Miracle Curative Tonic, and he appears at Apple Bloom and Granny Smith's performance at the Ponyville swim meet. He spends the entirety of the episode in a wheelchair and with a bandage wrapped around his head.

Season five
In Slice of Life, Donny appears with Jeff Letrotski and Walter at the Ponyville bowling alley. Dr. Hooves joins their bowling team in a championship game. Unlike his fellow "Lebowski" ponies, Donny does not appear in the audience at Cranky Doodle Donkey and Matilda's wedding.

IDW comics
Donny appears on the IDW comics' regular cover.

Merchandise
Donny appears on the Season 2 poster/DVD set packaging/T-shirt/WeLoveFine.com iPhone case, is shown in an image from The Cutie Pox on the back of Enterplay trading card series 2 #60 card "The Three Strikes?", and appears on the WeLoveFine T-shirt "My Little Urban Achievers".