Doctor Whooves is a pony popular with the show's fanbase.
His spiky brown mane and his hourglass cutie mark lend him the appearance of the Tenth Doctor from the popular British TV series Doctor Who, hence the moniker, which originated on the /co/ board on 4chan. The name was eventually (unofficially) adopted by the show's crew.[N 1]
The pony has officially obtained the name "Time Turner" in the Enterplay trading card set that debuted at the 2012 Summer BronyCon. Said name was given to the pony by Wendy/midori-no-ink, a consultant for the first batch of trading cards.[N 2][N 3]BaldDumboRat also came up with the same name, shortly before the release of the card. However, Guy Brand, owner of Mighty Fine, the company that runs the website WeLoveFine.com, claimed that, upon consultation with Hasbro, the pony's official name is "Dr. Hooves".[N 4] The guidebook released in June 2013 lists the pony's name as "Dr. Hooves".
Doctor Whooves as Time Lord
He is often imagined to have an English accent, despite pieces of dialogue in the actual show (Call of the Cutie and Sonic Rainboom) showing no traces of this.
In fan labor, Doctor Whooves is often accompanied by a companion, just like in the TV show. Examples include Apple Bloom (likely due to their previous interaction in Call of the Cutie), Roseluck (because of her resemblance to Doctor Who character Rose Tyler), Twilight Sparkle (likely due to her cutie mark involving a starburst, leading to the thought combination of TIME and SPACE, both part of the acronym TARDIS and TARDIE. It is also because some see her as Rose Tyler as well), and Derpy Hooves. Beyond fan art, there is also a notable series of audioplays (link to episode 1) and some pieces of fan animation (e.g. thesetwo by enquaynay).
This is the most common version of Doctor Whooves, especially in works where he is the primary protagonist. Whooves is the Doctor from another, humanoid dominated universe; aka, the universe depicted in the Doctor Who television show. The most common version of the Doctor which arrives in Equestria is the Tenth Doctor. Due to a dimensional mishap with the TARDIS, the Doctor is transported from his home universe to the My Little Pony universe and turns into a pony by either undergoing regeneration or simply being transformed by the universe's equine-centric laws. In either case, he then goes on to have a typically Doctor Who adventure with whatever companion(s) he picks up and has all his usual equipment and off-beat... Doctor-ness. Who-verse aliens and monsters typically show up either as they normally are or altered to fit the equine/four-legged model. In most fanfics, if the Doctor were to return to his dimension, he would return to looking like a human. If a pony from Equestria were to travel to the Doctor's dimension, they would then turn into a human (form and species will change depending on what universe they travel to).
Sometimes Whooves isn't from another dimension, simply a pony-verse's version of the Doctor (i.e., Whooves has always been a pony). He is usually stated as hailing from the planet Gallopfrey (a "ponified" version of the Doctor Who planet Gallifrey), making him the ponified version native to the Equestrian universe. He is part of a species known as the Time Ponies (ponified version of the Time Lords). This version can even have other things ponified such as the words read across the top of the TARDIS changed to ‘PONY PUBLIC CALL BOX’ and the TARDIS renamed TARDIE (Time and Relative Dimension in Equestria). This version of the character also allows for multiple Doctors to exist without causing a paradox (i.e., the "humanoid" one warps into Equestria and works alongside the equine one).
Alternatively, he's not technically an alien pony, just a strange one who may or may not have a time machine or power over time. This version could be based on the Peter Cushing version of the Doctor. He's usually an incidental or side character in this model.
Occasionally he is seen as a semi-background character where his involvement is merely hinted at. In these cases the residents of Ponyville usually know him under an alter-ego, much like the actual Doctor often used the name "John Smith" to blend in. There are also times when he is portrayed as a pony who actually believes this alter-ego, due to his Time Lord/Pony/Colt self having been stored in a fob watch using a chameleon arch, which, in the Doctor Who universe, is a special device used to store the essence of a Time Lord, allowing them to become a different person in their mind and change their physiology to that of a different species.
He is not Doctor Whooves, just a pony that happens to look like him. In this portrayal, he's just another Ponyville citizen who happens to have an hourglass for a cutie mark. Usually, he is depicted as a clockmaker or something of the sort. An example of this portrayal is Sepia Tock.
The other Whooves
There are other ponies in the show with the same hourglass cutie mark. Due to this repeated use of the cutie mark, some fans believe these ponies are regenerated versions of him, his companions, or family. One attempt to match ponies and Doctor Who characters can be found below.
The Master is the Doctor's nemesis; because of his blond hair he is compared to this pony, however he only had blond hair for two episodes. Some think he looks like the 5th Doctor because of the resemblance to actor Peter Davidson, while others say he looks like the 11th Doctor (Matt Smith) because of his bow tie. He can also be seen with Bon Bon in the beginning of The Crystal Empire - Part 1.
She is named after a partner in the series. Also after TARDIE (Time And Relative Dimensions In Equestria) by Whovians as a play-on-words for the Doctor's ship TARDIS (Time And Relative Dimensions In Space).