The series premiered on Syfy on December 6, 2017, receiving mostly positive reviews. It was announced that Syfy had renewed the series for a second season, which premiered on March 27, 2019. The series was cancelled by Syfy after two seasons. It is based on the four-part graphic novel of the same name.
Disgraced police detective Nick Sax lives as a social outcast, filling his days with light drinking and substance abuse, moonlighting as a hitman. After having a massive cardiac arrest, Nick comes into contact with a small, blue, winged unicorn named Happy that only he can see. Happy explains he is the imaginary friend of a little girl named Hailey, who has been kidnapped by a deranged man dressed as Santa Claus.