DreamWorks Dragons: The Series (Rated TV-PG for moderate violence) is a television series based on the film and also it's sequel. 
It began airing on Cartoon Network on Tuesday, September 4, 2012, having to release a new episode every Wednesday. Producer Tim Johnson has declared that the series will be "dark" and "deep". The show reveals more new species of dragons including the dragons from the Book of Dragons special. The series' musical score is written by John Paesano. 
Season 1 of the series is called Dragons: Riders of Berk, and Season 2 is called Dragons: Defenders of Berk. Season 3 with the name Dragon Masters, has been confirmed to be available on Netflix in the Spring of 2015. But it's still unknown if it will take place before or after How to Train Your Dragon 2

On August 7, 2012, an hour-long sneak peek was premiered containing 2 episodes (How to Start a Dragon Academy and Viking for Hire) that was never aired in the actual series. These episodes were indeed extras and did however contain information on how the Dragon Academy was started. The original air date for the series started with the episode Animal House followed by The Terrible Twos the next week.

Genre:
Action
Adventure
Comedy-Drama
Fantasy

Format:
CGI Animation

Created by:
Chris Sanders
Dean DeBlois

Developed by:
Linda Teverbaugh
Mike Teverbaugh

Theme music composer:
John Paesano
John Powell

Original channel:
Cartoon Network (Season 1 & 2)
Netflix(Seasons 3 & 4)

Original run:
August 7, 2012 – present

No. of seasons:
4

No. of episodes:
92 (40 aired)

-After Hiccup Horrorendous Haddock III discovered dragons could be trained, the Isle of Berk appeared to be safe, until its residents realized how many dragons there actually are! Now the battle against enemies as they explore worlds they never dreamed existed. Also, the relationships between Hiccup and Astrid, and Toothless, and Stoick will be further expanded upon.-

Cast:
Jay Baruchel as Hiccup Horrendous Haddock III
America Ferrera as Astrid Hofferson
Nolan North as Stoick the Vast
Chris Edgerly as Gobber the Belch
Christopher Mintz-Plasse as Fishlegs Ingerman
Julie Marcus and T.J. Miller as Ruffnut and Tuffnut Thorston
Zack Pearlman as Snotlout Jorgenson
Thomas F. Wilson as Bucket
Tim Conway as Mulch
Brook Chalmers as Sven
Mark Hamill as Alvin the Treacherous, leader of the Outcasts
Paul Rugg as Savage, Alvin's second-in-command
Stephen Root as Mildew
David Faustino as Dagur the Deranged, leader of the Berserkers
Michael Goldstorm as Trader Johann
Mae Whitman as Heather
Anna Maria Perez de Taglé, as yet unaired