Serenity Media Group seems like a total scam. I was cold-called about investing in one of their films that are supposedly in production, "Dorothy of Oz". After googling the film, I discovered that several state judges have barred these companies (Serenity Media, Alpine Pictures, Summertime Entertainment) from selling any more shares.
Do not invest with Serenity Media Group without getting a lawyer.
Here is one of the online links that made me suspect Serenity Media Group of being a scam: http://www.corp.ca.gov/ENF/pdf/2009/DorothyOz_dr.pdf