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.

Aunt Clara visits and believes her powers have finally blown a fuse, but in truth, Tabitha is the culprit. Samantha sends Aunt Clara home. Without a baby sitter, the Stephens invite the Tates over to their house. Darrin is convinced the floating objects are the result of Clara's power failure until he pratically catches Tabitha in the act. The Stephens decide to make Larry believe he's had too much to drink in hopes he and Louise will leave before the night is a complete disaster.

The Witches Council orders a coven. Tabitha is being tested for her powers by Hagatha and Enchantra, Endora's sisters who certifies true witches and warlocks. Tabitha passes with flying colors, proving to be an exceptionally talented witch. Hagatha, Enchantra and Endora insist that Samantha enroll Tabitha in a witches' school. After being booby trapped by phone cords and flat tires, Darrin comes home exactly when the decision is made. Darrin, Samantha and Aunt Clara stand against Hagatha, Enchantra and Endora, but Maurice chills the three witches--zapping them to the top of Mount Everest.

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.

Endora and Uncle Arthur have a falling out over who is to live in a house across the street. Gladys wants to find out about the disappearing and reappearing house, much to Sam and Darrin's dismay!

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

A mysterious man named Diaper Dan has bugged the Stephens' household to steal advertising ideas from Darrin for a rival advertising company. No one finds this out until Samantha and Darrin gets into an argument. Dan hears all this and has flowers delivered to the house. After Samantha finds out that the flowers were delivered by Dan, she discovers the leak and the bug! Sam and Endora both give Dan a hard time.

Hey, who turned out the lights? Aunt Clara knocks out the entire Eastern Seaboard's electricity with her magic. Her only hope is her old boyfriend Ocky, who can keep the lights on by having his arms raised. Since they are the only house that mysteriously has power, The Tates and their new client Mr. MacElroy go over to Sam's house. Aunt Clara tries her best to keep Ocky hidden from view by hiding him in the closet. Darrin discovers him, but all he sees is a pair of walking shoes, a perfect campaign for his client!

When Samantha gives away Darrin's favorite jacket to Goodwill, it ends up tearing the marriage apart. The Stephens get counseling from the Tates and Endora conjures the famous Sigmund Freud to help them all out.

Because of a spell placed on a bowl of popcorn by Endora, Darrin becomes a great big couch potato. Samantha finds out what is going on when she finds Darrin, the milkman, and a TV repairman lazing around the messed up house. Samantha calls on Endora to take the spell off of them.

A chair is smitten with Samantha and proves it by hurting Darrin every chance it gets. The new clients, the Cosgroves, are crazy about the chair, especially Adelaide who will not let McMann and Tate sign their contract. Of course, the chair ends up hating Adelaide for her behavior. Samantha gets to the bottom of this mess. The chair is actually an old boyfriend whom Samantha rejected a long time ago.

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.

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.

Samantha applies for a loan to tear down a gazebo and to construct a rumpus room. The nosy bank inspector comes down to check out the land and sees a live baby polka-dotted elephant mistakenly conjured by Aunt Clara. The baby elephant was from a toy that Tabitha had wanted in the park. Larry comes by to see what the fuss it all about, and Samantha tries to hide the big baby from him.

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.

Darrin is mesmerized by the moon footage on TV and shows Samantha, but she is not interested because she has been there before. Endora wants Samantha to go shopping with her- in Tokyo! They go to a little place where they get warlock tea. Darrin finds the tea and thinks that Samantha really did go to the moon. He has it analyzed and the druggist brings his cousin from Nassau County (Darrin thinks it is NASA) to give him the results: It is really tea, not moon dust.

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 sees an excellent car in a magazine and wishes he had one just like it. Endora pops one up for him, not knowing that the car she gave him was a top secret car from Detroit. Not only does Darrin love the car, his new client Mr. Sheldrake, loves it too. As Sheldrake takes a test drive, Endora returns the car to Detroit- with Sheldrake in it!

Aunt Clara thinks that she is worthless and barren and wants to turn herself into something useful. Samantha discourages her from abusing herself and invites her to go to lunch with Darrin. At Darrin's building, Samantha leaves for a moment and Aunt Clara finds a seat in a covered-up display and falls asleep. Meanwhile, a policeman and a animal handler are fighting about having a cow in the building. This cow is actually the Morton Milk cow and it runs off. Samantha comes back to see this cow and thinks that Aunt Clara made good on her threat. She twitches the cow home to try to turn her back into her beloved aunt. Back at the building, the cow ends up missing and Darrin finds Aunt Clara. Samantha notices her mistake and returns the cow to its rightful owner.

The Witches' Council puts Aunt Clara on trial because of her failing magic. She learns that she is to be stripped of her witchcraft and calls upon Samantha to help her. When they are about to give Aunt Clara her sentence, Darrin walks in and Clara makes the entire courtroom disappear!

Endora gives Darrin three wishes. First he wishes that Larry goes to Hawaii instead of him. Then Darrin has to meet Buffy, a model, for a business lunch and Endora thinks the worst. It really gets serious when Darrin and Buffy fly out to Boston and a snowstorm grounds all planes from flying out. So Darrin gives Buffy his hotel room and he stays at the airport. At home, a message comes for Darrin and Samantha calls his hotel room in Boston only to hear Buffy at the other end. When Darrin comes home, Samantha thinks that he had an affair with Buffy and threatens to leave him, thinking that he used his wishes on Buffy. Darrin straightens her out by saying that he still have two wishes left. On his second wish, he wishes that Endora will appear before him and Samantha apologizes to Darrin for not believing him.

Endora gives Darrin an outstanding memory by hexing his watch, but Darrin learns the hard way that sometimes it is better to forgive and forget.

Samantha is doing a painting for an art gallery contest, and Endora doesn't think it is up to snuff. So she takes it upon herself to change the painting so Sam can win. And Sam does win, but she doesn't want the prize because of what her mother did.

Darrin's old college rival, Charlie Harper, has a very successful life and wife Daphne loves to brag about it--their castle has a moat! During a weekend visit to the Harper's latest home, Samantha unintentionally upstages Daphne, creating tension between the two. Finally, Samantha plays Daphne's game, and zaps a loaded jewelry case and a mink coat (made of identical twin mink pelts.) Darrin's ego is hurt. How can he compete with Samantha's witchcraft? To make amends, Samantha gives the coat to Daphne after she insists that the Stephens sell it to her. Samantha reassures Darrin she could zap up mink coats all day long, but she could never zap up another Darrin Stephens.