Cinematic

A cinematic is another word for a movie, typical of the style in which these movies are made. There are currently three official cinematic released by Riot and one unofficially released cinematic..

Welcome to League of Legends
Published by Riot Games in 12th of July 2010, it is the very first cinematic made to promote League of Legends.

List of champions in order of appearance:

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Dominion
Showcasing the newest game mode, Dominion, this trailer was accidentally aired on the Brazilian Championship Stream in 25th of October 2012. It was developed by Riot but subsequently scrapped and never officially released.

List of champions in order of appearance:

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A Twist of Fate
Published by Riot Games in the 25th of May 2013

The also makes an appearance at the end. This was a teaser by Riot as to what the Baron Nashor may look like in a future visual rework, confirmed with the Summoner's Rift visual update in July 2014.

List of champions in order of appearance:

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See also: League of Legends Cinematic: A Twist of Fate - Behind the Scenes

A New Dawn
Published by Riot Games in the 22nd of July 2014.

Day breaks over a landscape consecrated by blood and steel. A battle begins as a new dawn rises. Following A Twist of Fate, we created A New Dawn to explore fleshed-out champion interpretations and brutal team fights in ways they’ve never been seen before.

Official Announcement here

List of champions in order of appearance:

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See also: League of Legends Cinematic: A New Dawn - Behind the Scenes