The programme was first broadcast on 4 April 1985. From 1985 to 1989, the original T-Bag is Tallulah Bag, played by Elizabeth Estensen. In 1990, Elizabeth Estensen left the show and was subsequently replaced by her sister, Tabatha Bag, played by Georgina Hale
Both sisters obtain magical powers by drinking tea made from the 'High T-Plant' and both are incapable of brewing it properly themselves and require an assistant or 'Tea Caddy' to do it for them. In return for his help, T-Bag shares her magical powers with her assistant T-Shirt (Thomas Shirt), played by John Hasler throughout the series. He started as a small child in the early series, and grew up on screen until he towered above Georgina Hale by the time the final series ended in 1992. T-Shirt is presented as T-Bag's constant companion, part harassed surrogate son, part household servant. T-Bag and T-Shirt's magical powers, (rather limited, owing to cheap 1980's special effects) mostly consist of conjuring objects out of thin air when needed, sending objects elsewhere and teleporting across time and space instantaneously. T-Bag triggers her teleport ability by clicking her fingers, T-Shirt finds finger clicking too difficult and blinks instead.The premise of each series involves various items hidden across time and space with T-Bag and the heroine both trying to find them. Debbie Carter, played by Jennie Stallwood is the heroine of the first three series. Diana Barrand took over for series four as child television presenter; Holly Anna Jones. Kellie Bright, who later appeared in The Upper Hand and The Archers, played Sally Simpkins in series five and six plus a Christmas special. In T-Bag and the Rings of Olympus, the heroine is the Goddess Athena's handmaiden, Polyzena, or Polly, played by Natalie Wood. In T-Bag and the Sunstones of Montezuma, Archeologist's daughter; Penny Hunt is played by Evelyn Sweeney. Typically, each episode also features two non-regular cast members to progress the story.
Each episode has a different setting in which the magical item is hidden. These are often historical settings or settings from folklore or literature, such as ancient Egypt, ancient Rome, Renaissance Italy and Elizabethan England or Tom Sawyer's American South, Robin Hood's Sherwood Forest, or a French Foreign Legion station in North Africa which owes something to Beau Geste. Sometimes historical figures such as Napoleon, Leonardo da Vinci or Queen Elizabeth I make a guest appearance. T