Valve's Free to Play Dota 2 documentary available now - GameSpot

After being in production for a number of years, Valve's "Free to Play" Dota 2 documentary is now available on Steam, and iTunes.
Dota 2 features the characters and factions from the original Defense of the Ancients title with new features.

Valve's Dota 2 documentary 'Free to Play' hits Steam today, Twitch screening confirmed

History] Legendary Dota video from 6 years ago : r/DotA2

Snapfire got cosmetic items in underlords before dota : r/DotA2

Valve launches this 'Dota' game for Android and iOS, crossplay and more - Times of India

I think this (summary) review of Dota 2 pretty much sums it up : r/DotA2

What games are considered eSports and why? - Quora

Dota 2 The International: Alliance wins $1.43 million

Dota Underlords - Trailer

Dota Underlords - Metacritic

Valve's Dota 2 Documentary Free To Play is Coming To Netflix