T-Bag was a children's television program from the 1980's about a witch called T-Bag (short for Tallulah Bag I think). T-Bag's nephew was called T-Shirt!
In each episode there was a girl who used to have to complete a task in order to defeat the plans of T-Bag.
In total 94 episodes were filmed over a number of years including a couple of Christmas specials.
Originally T-Bag was played by Elizabeth Estensen who went on to play Diane Blackstock/Sugden in Emmerdale Farm and a regular guest was Roy Barraclough who appeared on the Les Dawson Show and in Coronation Street amongst other things.