The series will focus on 11-year old Martin Moone, the youngest child in a family in small-town Ireland in the late 1980s and early 1990s, whose fertile imagination gives birth to an imaginary friend, Sean, a role to be played by O'Dowd.
Martin, who has a "unique perspective on life", constantly devises ridiculous schemes to help himself cope with family life - often against Sean's better judgement. His vivid, cartoonish drawings will be brought to life with animation throughout the 6-part series.
Chris O'Dowd says: "Moone Boy is a fantastic comedy which centres on a ten year old boy who has an imaginary friend. It is set in the late eighties/early nineties and all of the experiences are ones that I had. It's a really funny show which has loads of animation and a number of laughs that I hope people will love."
All six episodes have been written by O'Dowd and Nick Vincent Murphy, and will also star Steve Coogan, co-founder of Baby Cow, and Johnny Vegas. The role of Martin has yet to be cast, and the series will be filmed on location in Dublin and O'Dowd's home town of Boyle.
The following clip is from the original short, Capturing Santa.