Darrin forbids Samantha to attend her cousin Mario's wedding in Egypt. Endora, who is livid, states that Darrin is in "big trouble". Darrin gets a new assistant named Gideon Whitsett. Darrin is convinced Gideon is a warlock enlisted by Endora as a series of events makes Darrin look bumbling and stupid in front of a new client, and in turn makes Gideon look fantastic. Samantha uses a little magic to find out that Gideon is actually a conniving young man.

Samantha and Darrin spend the night at a hotel and Samantha briefly changes her hair to brunette. Larry spots them and thinks Darrin is having an affair. Larry proceeds to tell Louise. Louise meets with Darrin at a hotel hoping to convince him to drop the other woman. Larry spots them and thinks Darrin's other woman is Louise.

Samantha and Endora enjoy lunch at a great pizzaria owned by Mario. It seems that he is not selling pizzas and his business is going down the tubes. Samantha and Endora try to help out Mario, but ends up getting Darrin's job in danger.

Aunt Clara remembers the spell to bring Franklin back when nosy Gladys Kravitz tells all about the Stephens' happenings. It seems that Franklin will be punished to the full extent of the law when Larry tells about how great a publicity stunt it is, with the District Attorney listening! With a little bit of magic, Samantha gets the people to root for Ben Franklin. In court, Samantha tells everyone that Ben Franklin has done no harm ever since he appeared and that he cannot be accused for stealing his own property. The judge drops all charges and Franklin is free to go.

When Darrin begins searching for a beautiful model to play "Miss Jasmine", Endora sees it as an opportunity to break up her daughter's marriage and sends a gorgeous witch to seduce him. Samantha recognises model Janine Fleur as Sarah Baker the witch. Sarah is determined to fulfil what she set out to do, namely seduce Darrin despite Endora calling off the contract. Samantha, who still has faith in her husband, just wants her battle with Sarah to be on an even playing field.

Aunt Clara comes to visit when Samantha meets Darrin's parents or the first time, his mother, Phyllis feels pushed aside, but his father Frank likes Samantha, thinking she's a lovely girl. When her daughter-in-law serves a magnificent dinner, Samantha confesses that it was actually Aunt Clara who helped her with the food, and that she is still learning how to be a magnificent cook.

Samantha hires Zeno the Great to perform at a charity bazaar and becomes his assistant to help the magician gain self-confidence. When Roxie, Zeno's former assistant, returns to capitalise on his newly found fame, Samantha tries to stop the scene-stealing.

When an ankle injury confines Darrin to bed, Samantha enchants the house so it can fulfil Darrin's needs. Darrin becomes intoxicated with the idea of magic, and starts encouraging Samantha to use her powers, but the change is not all for the better. Darrin quits his job and wants to travel the world. But soon he comes to realise he likes his old life better.

Promising to behave when she meets Darrin's parents, Endora turns on the charm and is promptly accused by Darrin's mother Phyllis of trying to steal her husband Frank's affections. Frank takes Endora to a play when Phyllis refuses to go. Phyllis wants a divorce when Frank doesn't come home that night, but he actually locked himself out and stayed at the club. Endora and Samantha use a little witchcraft to get them together.

Knowing that Darrin needs a new model for a campaign, Samantha turns a stray Siamese cat into an attractive woman named Ling Ling. Ling-Ling, who knows she's a cat brings those cat sensibilities to her human life, Wally starts to fall in love with her. Ling-Ling likes the attention she is receiving from Wally and wants to stay human. Samantha has to figure out how to tell Darrin the truth about Ling-Ling while she and Darrin try to persuade Wally that Ling-Ling is not the right woman for him.

The mayor, ignoring his constituents' request to have a traffic light installed at a busy intersection, needs some of Samantha's witchcraft to convince him otherwise.

To assist her daughter in a dress fitting, Endora transforms herself into a double of Samantha. While at the fitting, Robert Frazer, a young writer, becomes smitten with her. Endora decides to cavort with him as Samantha. Meanwhile, Gladys Kravitz thinks Samantha is having a secret affair. There are further complications when it turns out that Bob is an old friend of Darrin's. Endora shows up as Samantha at a dinner that Darrin, Sam and Bob are having. Bob now believes Endora is Sam's twin.

After an argument while he is teaching her to drive, Darrin enrols Samantha in a driving school. The owner assigns his nervous brother-in-law Harold to teach her. Samantha gives Harold a little self confidence.

Samantha uses her powers to open her garage door as Gladys is watching from across the street. Darrin and Samantha buy an electric garage door to avoid further suspicions from Gladys, but unseen mortal technology causes additional problems and suspicions.

While Darrin spends time with neighbour Pleasure O'Reilly's sister, Dora "D.D." Danger O'Reilly, Endora arranges for handsome warlock George to woo Samantha to break up her marriage to Darrin. But when George arrives on the scene, he isn't sure if it's Samantha he wants or Danger.

Gladys and Abner have yet another fight, but this time, the frustrated busybody kicks her husband out of the house. Abner seeks shelter at the Stephens' home and quickly wears out his welcome. Sam decides to reunite the couple by having them simultaneously dream of the day Abner proposed.

Endora decides to experiment with different looks to Darrin's face while he is taking a nap. As Samantha forgets to change him back, a horrified Darrin sees the transformation they did to his face after he awakens. He becomes self-conscious about the way he looks. Samantha disguises herself as a sexy French sculptor to help repair her husband's tattered ego.

Like many other series of 1966, the third season opens in glorious color. Samantha takes Tabitha for her check up, only to discovers that she (now a little toddler) has her powers! Endora can hardly wait to tell Derweed and watch him ""fall to the floor in a emotional heap."" Meanwhile, a client of McMann & Tate insists on using Tabitha's image to sell transmitions, and famous baby photographer Diego Fenman thinks he's lost his mind as Tabitha creates chaos in the studio. In the final tag, Darrin is still unaware of Tabitha's magical abilities.

Samantha is babysitting little Jonathan Tate, and Aunt Clara turns him into a set of twins. Now how are we going to explain this to the Tates? While Aunt Clara tries to remember the spell, Samantha does everything to keep Larry and Louise from knowing that they have an extra son.

Meet Gerri O'Toole, a nymph who hates witches. She has a curse on Darrin's family, that can only be broken by having Sam go back in time to meet Darrin's ancestor, Darrin the Bold.

While Endora throws a Halloween party, she and Uncle Arthur are still clashing over the house across the street, and Gladys is still dumbfounded.

Aunt Clara tries to help Samantha fix a lamp, and conjures an electrician, none other than Benjamin Franklin. Darrin is amazed at Franklin's appearance and Larry thinks it is a great advertising campaign for his new client Franklin Electronics. Samantha agrees to take Franklin out to demonstrate how his inventions are used in the twentieth century, but he goes out alone! After a mishap with a fire engine, Ben is arrested. Out on bail, the Stephens return home, but now, Ben disappears! Clara has remembered the spell........ to be continued.

Samantha helps a little boy named Johnny Mills practice for a Soap Box Derby. After Gladys brags about how her nephew will do better than anyone there, Samantha helps Johnny out, repairing a wobbly wheel with a twitch. Samantha tries to get Johnny's father involved, but he wants Johhny to attend college and become a doctor, not a race car driver or mechanic. At the Derby, Gladys and Darrin keep a sharp eye on Samantha so that she doesn't help Johnny, but magic is unnecessary when Johnny wins on his own merit. The announcer wants to congratulate Johnny's father, who isn't there to see his son triumph. Samantha pop's back to Johnny's father's garage, who is too busy to break free. Samantha repairs a carberator and 3 tires, encourging Mr. Mills to rush to the Derby for his son.

Samantha and Endora take Tabitha to a taping of Ho Ho, the Clown, where Darrin's newest client, Solow Toys, is the sponsor. Because Tabitha is related to Darrin, she is prohibited from the contests. Endora does something about that and makes Ho Ho fall in love with Tabitha and gives her all the prizes. This jeopardizes both Darrin's job and causes the show to be cancelled if they don't do something soon. Samantha comes up with a terrific plan: Tabitha's appearance on the show was a publicity stint for a new Tabitha doll.

Darrin is warned by Sam not to kiss a beautiful client named Terry Warbell. There is a good reason: she is a magic crone who steals the youth of poeple that she kisses. Of course, Darrin doesn't believe Samantha, but he sees for himself when Terry turns into the old hag.