Speaking to the Radio Times, Mangan explained that the show focuses on the process of making the US remake of a popular British programme.
He said: "Tamsin Greig and I play British sitcom writers whisked to Los Angeles to remake their comedy, only to discover that studio execs have totally mangled their original - trading its schoolroom setting for an ice hockey locker room, casting Matt LeBlanc as the lead and changing its name to Puck."
Mangan added that he sometimes felt awkward about playing his character because it was based on one of the writers on Episodes.
"We're actually playing versions of the writers - Friends creator David Crane and his partner Jeffrey Klarik - which makes for interesting rehearsals," he joked. "I'm the happy, optimistic, peace-making one and Tamsin's the spikier one, concerned about artistic integrity.
"I'm like a wet puppy in front of a warm fire - delighted to be there. She's just damp. They make the perfect team."
Episodes is expected to air on BBC Two in November and will premiere in the US on Showtime on January 10, 2011.
> LeBlanc: 'Episodes character is not me'