Stars of the 1970s Saturday morning show Swap Shop, including Noel Edmonds, are to reunite for a one-off special.
Keith Chegwin and Noel Edmonds were two of Swap Shop's hosts
The two-hour programme will also look back on other shows of the genre, including Saturday Superstore.
Other Swap Shop stars, including Keith Chegwin and John Craven, will appear along with Posh Paws, the purple dinosaur who was the show's mascot.
The programme's makers are looking for people who appeared on Saturday morning shows to take part in the special.
Contributors who took part in a swap or had a film crew in their house on one of Chegwin's outside broadcasts are being asked to come forward to mark the 30th anniversary of live Saturday morning TV.
Swap Shop's chaotic studio set
It Started With Swap Shop, due to be aired between Christmas and the New Year on BBC Two, will relive some memorable moments from Saturday morning TV, and will feature celebrity swaps.
Edmonds, who recently revived his TV career as host of gameshow Deal Or No Deal, said: "I have some amazing memories and a special affection for Swap Shop. It was a programme that broke the mould and I am proud to have been a part of it.
"The show's going to be like a giant party... old friends reunited!" he added.
Multi-Coloured Swap Shop, which ran on BBC One from 1976-82, was the first live show of its kind, containing cartoons, live guests and outside broadcasts.
Young viewers used to phone the programme and offer items to exchange for something they wanted, the best of which would be placed on the "swap board".
The programme was replaced by a succession of derivatives, including Going Live and Live and Kicking.
Anyone who contributed to Saturday morning shows and would like to take part in It Started With Swap Shop should visit www.saturdaymornings.co.uk for further information.