The door out of Stable Two was closed and sealed. Only the Overmare knew the secrets to opening it, assuming it even could open.
– Littlepip's Monologue
Chapter 1

An Overmare (or Overstallion in some cases) is the leader of a Stable-Tec Stable. The Overmares were often aware of the Stables being an experiment and helped coordinate it. The purpose and appointment of an Overmare varied depending on the Stable.

Most notable among the Overmares is Sweetie Belle, who served as the first Overmare of Stable 2.

Known Overmare's/Stallions

Sweetie Belle - Was the first Overmare of Stable 2

Stable 2 Overmare - She was the current Overmare when Littlepip and Velvet Remedy left Stable 2. Her real name is not mentioned by either of them.

Stable 24 overstallion- He was the current overstallion of stable 24 when the chimera were created. 

Stable 29 Crusader Maneframe - The stable-tec crusader maneframe was installed as the overmare of stable 29 .

Stable 101 overmare- The overmare of stable 101 when Red Eye poisoned the stable's residents.

In Other Stories

Project Horizons

Stable 99 Overmare  - Allowed Deus access to Stable 99, when she felt her reign/control over the stable was slipping.

Outlaw

Unmarked Stable - The Overmare was Brightest Future. Her companion A.I. Wave, went corrupt and took over the stable, killing most of the population, including the Overmare.

New Beginnings

Stable 66 Overmare - Used cybernetic implants to try and take total control of the stable dwellers. Turned the ponies inside into a hive-mind whose goal was survival and expansion.

Morality of Property

Shimmercoat - He was the Overstallion of Stable 11. Broke the traditional cycle of sacrifices by using captured wastelanders.

Ouroboros

Stable 17 Overmare & Overstallion - Stable 17 had a pair of ponies managing the stable, instead of a solitary leader.

Broken Steel

Stable 88 - Blueberry Muffin was the first Overmare. Her descendant, another Blueberry Muffin was also Overmare.

Old Souls

Stable 69 (probably Stable 61?) - Unnamed. She is a pegasus who exiles Snowflake for uncovering a relic of 'Old Equestria', which is against the Stable laws. Described as having more of a winning smile than a beautiful one.

Silence

Stable 75 - Sweet Cheeks is both the Overmare and the hotel manager of Stable 75 in Stable Town.

Behind the scenes

The Overmare is a reference to the Overseer,the leader of a vault in the fallout games.

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