The 48-year-old Today FM host is back in RTE this week to record a special edition of The School Around The Corner.
D'Arcy, who shot to fame as presenter of kids' TV programme The Den, is back working with children for a one-off Christmas special.
The long running show -- a childhood favourite -- will be aired on RTE1 during the festive season.
Filming on the one-hour special was taking place today.
The School Around The Corner first arrived into Irish homes on RTE radio in 1954, before making the move to RTE television in 1961. It made its name as a comedy show, as school children are interviewed for a humorous take on everyday life.
D'Arcy will be the fourth presenter to take the reigns of the hit show, which made a household name of original presenter Paddy Crosbie.
Late broadcaster Gerry Ryan and presenter and journalist Frank Mitchell fronted the school show at different times in the 1990s.
D'arcy is no stranger to presenting children programmes and presented The Den on RTE Two for nine years. He is currently at the helm of his own morning radio TV show on Today FM.
The presenter also has plenty of experience with children as he's father to Tom (5 months) and five-year-old Kate.