Here are the release dates for The Man Who Lost Christmas (1-6):
Release Date: December 24, 1948
Title: "The Man Who Lost Christmas"
Network: BBC Television Service
Release Date: December 25, 1948
Title: "The Search for Santa Claus"
Network: BBC Television Service
Release Date: December 26, 1948
Title: "The Rescue of Santa Claus"
Network: BBC Television Service
Release Date: December 27, 1948
Title: "The Return of Santa Claus"
Network: BBC Television Service
Release Date: December 28, 1948
Title: "The Christmas Party"
Network: BBC Television Service
Release Date: December 29, 1948
Title: "The End of the Journey"
Network: BBC Television Service
It's worth noting that The Man Who Lost Christmas is considered to be the first-ever sci-fi TV series.