Catweazle is casting spells in his secretive cave in ''the great forest'' and his chantings are overheard by the Normans who enter his cave and attempt to capture him for practicing witchcraft. Biting one of the soldiers he is able to escape into the forest complete with his ''familiar'' ''Touchwood''. He is chased by some other Norman soldiers and is trapped by them leaving him no option but to dive into the lake. He reappears in a small pond located at Hexworth Farm in 20th century England having flown through time 900 years into the future. Here the magic of his journey begins. Hiding himself in a barn at Hexworth Farm he soon meets up with Edward (aka Carrot) when he returns to the barn with farmhand Sam riding on the farm's tractor whose noise scares Catweazle. Carrott manages to hide Catweazle from his father despite the strong smell on Catweazle's clothes. Carrott promises to bring Catweazle food later in the evening and this is where the fun begins.

Returning to the house to learn about the ''Electrickery" Catweazle hears the kettle whistling in the kitchen and thinks it's a demon. He hides under the dining room table and draws a circle in chalk around him to protect himself whilst blowing on his magic thumb ring and chanting ''sator arepo tenet opera rotas''. Meanwhile Carrot's father comes into the house and can smell the same smell he first noticed in the barn the night before. Wondering how he can get Catweazle out of the room he deliberately knocks something over on the table and his father leaves to get something from the kitchen to clean it with. Trying to leave the house Catweazle is almost spotted by farmhand Sam and takes himself up to Carot's bedroom. After trying to clean the chalk stain off the carpet that Catweazle had made, Carrot follows his nose up to his bedroom where he finds Catweazle hiding in his wardrobe. Catweazle is in awe of how Carrot discovers him and then begs to be shown the ''magic of electrickery"...

Mrs Bonnington a local council member is a frequent visitor to Hexworth Farm much to Carot's dislike. He decides magic is needed to get rid of her and seeks out Catweazle's help. By using a spell from Rapkyn's book it's decided to make a doll to represent Mrs Bonnington and on the 7th chime of the church bell the spell will take effect. However they need a personal item from Mrs Bonnington to make the spell complete. Looking in her car for a personal item they find nothing and Catweazle is forced to hide in the back of her car when she leaves the farm for a hairdresser's appointment. Carrot follows on his bike and they arrive in the local village and concoct a plan to obtain a personal item. Catweazle describing the hairdresser's as a torture chamber and saying that removing hair is a loss of strength as per Samson in the Bible and realises this is the answer to thier problem.

Catweazle gets involved with the TAB and also confronts a fake fortune teller played brilliantly by veteran UK character actress/comedian Hattie Jacques. Unable to reach the betting office (''bettering'' as Catweazle refers to it) farmhand Sam asks Carrot to place the bets for him. However as he is underage he seeks help from an uncooperative Catweazle. Forcing him to dress in old scarecrow clothes to go into the village via a bus (referred to as ''thou roaring chariot'' by Catweazle) it is here that Catweazle sees a sign that points to the fortune teller's rooms. He then goes to see her and tells her that she doesn't have ''the eye of time'' that it is ''shut'' to her and that she tells customers to bet on the wrong horses and then rings the local bookie that another false customer is on his way.

Whilst hunting around the farm for old items Catweazle is accidentally photographed by a couple of Yank photographers/tourists one of whom becomes obsessed with the uniqueness of his face. When the photos are developed she returns to the farm and shows Carrot the photos who then shows Catweazle who believes he is now doomed and owned by the photographer and believes he must go to her and become his slave. The photographer gets Catweazle to clean her flashy sports car while she and her female partner (who is very masculine - suggesting lesbian overtones albeit very subtly afterall this was a children's tv series) go off to take photos. Meanwhile Carrot arrives at thier residence and goes to steal the photos taken of Catweazle from inside the house so as to remove the spell Catweazle believes is now on him. Carrot tells Catweazle to keep watch and to honk the car horn if the photographers return.