MLP:FiM Episode Reviews: Character and Story Analysis by Half the Battle

Building the World of My Little Pony: Friendship Is Magic

I originally intended to collect a list of "world-building" episodes that established the lore, history, and structure of Equestria. But in the course of my reviews, I discovered that every episode added at least something to the MLP universe, and usually more than just a new character or two. So what follows instead is a list of what aspects of the world of MLP are introduced in each episode.

Season 1

Friendship Is Magic, part 1

Friendship Is Magic, part 2

The Ticket Master

Applebuck Season

Griffon the Brush Off

Boast Busters

Dragonshy

Look Before You Sleep

Bridle Gossip

Swarm of the Century

Winter Wrap Up

Call of the Cutie

Fall Weather Friends

Suited for Success

Feeling Pinkie Keen

Sonic Rainboom

Stare Master

The Show Stoppers

A Dog and Pony Show

Green Isn't Your Color

Over a Barrel

A Bird in the Hoof

The Cutie Mark Chronicles

Owl's Well That Ends Well

Party of One

The Best Night Ever

Season 2

The Return of Harmony Part 1

The Return of Harmony Part 2

Lesson Zero

Luna Eclipsed

Sisterhooves Social

The Cutie Pox

May the Best Pet Win!

The Mysterious Mare Do Well

Sweet and Elite

Secret of My Excess

Family Appreciation Day

Baby Cakes

Hearth's Warming Eve

The Last Roundup

The Super Speedy Cider Squeezy 6000

Read It and Weep

Hearts and Hooves Day

A Friend in Deed

Putting Your Hoof Down

It's About Time

Dragon Quest

Hurricane Fluttershy

Ponyville Confidential

MMMystery on the Friendship Express

A Canterlot Wedding—Part 1

A Canterlot Wedding—Part 2

Season 3

The Crystal Empire—Part 1

The Crystal Empire—Part 2

Too Many Pinkie Pies

One Bad Apple

Magic Duel

Sleepless in Ponyville

Wonderbolts Academy

Apple Family Reunion

Spike at Your Service

Keep Calm and Flutter On

Just for Sidekicks

Games Ponies Play

Magical Mystery Cure

My Little Pony: Equestria Girls

Season 4

Princess Twilight Sparkle—Part 1

Princess Twilight Sparkle—Part 2

Castle Mane-ia

Daring Don't

Flight to the Finish

Power Ponies

Bats!

Rarity Takes Manehattan

Pinkie Apple Pie

Rainbow Falls

Three's a Crowd

Pinkie Pride

Simple Ways

Filli Vanilli

Twilight Time

It Ain't Easy Being Breezies

Somepony to Watch Over Me

Maud Pie

For Whom the Sweetie Belle Toils

Leap of Faith

Testing, Testing, 1 2 3

Trade Ya!

Inspiration Manifestation

Equestria Games

Twilight's Kingdom—Part 1

Twilight's Kingdom—Part 2

I believe the point has been made. Suffice it to say, world-building continues in Season 5.