Having put his pot-smoking days behind him, Adam Myers has become a celebrated comic book writer after creating a popular but controversial, joint-smoking superhero called Weed-Man.

Rescued from an attempted kidnapping by a top-secret British security organisation, Appendix 9, he is astonished to learn that he possesses the same superpowers as his comic book creation.

Appendix 9 needs his help to defeat a mysterious and powerful new villain. With this in mind, Adam trains to become the unlikely real-life superhero: Weed-Man.