Joe Penna, one of the most creative forces on YouTube, is launching a new orignal series on the MysteryGuitarMan channel featuring Mark Gantt, Taryn O’Neill, and Princesstard from Shaytards.

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The new series, Once Upon, features Penna as “MysteryGuitOldMan,” a character introduced earlier this month, who tells the story of the origins of his little brother, “Teeny Joe,” who was featured in a June 2010 MGM video. The series is full of all the creative effects we’ve come to expect from MGM, including an infant that sprouts from a plant bulb delivered by an exotic bird.

“YouTube is all about trying new things and constantly re-inventing yourself,” Penna told Tubefilter. “Plus, it’s a great way to get immediate, honest feedback on your work. So, I’m excited to be trying out this 5-episode miniseries on my channel.”

Once Upon is MysteryGuitarMan‘s first web series—though Penna humbly noted, “Can it be called a “web series” if it doesn’t have Felicia Day in it?” LOL.

On his second channel jp, Penna teased out news of the series last week with behind the scenes videos featuring Princesstards and getting into his old man makeup.

Penna was featured on Tubefilter’s Secrets of YouTube Superstars panel at CES 2011, and The Digitour: Debriefed at the Tubefilter Hollywood Meetup.

The first episode of Once Upon drops today, with new eps coming out every Tuesday until December 20th.

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