Martin Moone is a young boy who relies on the help of his imaginary friend Sean to deal with the quandaries of life in a wacky small-town Irish family in the 1980's.
Martin and Padraic travel to Dublin whilst Liam runs into a former flame.
Fed up with being caught between two warring parents, Padraic disappears with Martin. Crunchie Haystacks finds it hard to cope.
While the Moone house is bursting at the seams, Martin and Padriac try to film a hilarious home video.
After crop circles appear in Boyle, Martin attracts media attention when he claims his donkey has been abducted by aliens.
Dessie works on a new business venture as he plans to open Boyle's first Catholic book shop. Martin, meanwhile, embarks on a building project.
Martin and Sean discover Grandad also has an imaginary friend.