It was originally released as a pilot for Cartoon Network.
2017 (promotional poster)
On December 1st, 2017, it was announced that Netflix had picked up Twelve Forever for a full series release coming 2019.  The series itself is available there from July 29, 2019.
|Original series and films productions:|
Netflix Originals | Netflix Animation
Millarworld | Red Envelope Entertainment | DVD.com | Netflix Jr. | Netflix Futures | Netflix is a Joke