Rita King and her son Mike, arrive from America to start a new life in England. Living in a strange old house, Mike pines for the home and friends he has left behind. But he is not lonely for long because lurking in the house is Angelo.
Rita discovers that Mike has a new friend called Angelo but doesn't know whether or not to let Angelo stay.
Rita is busy so Mike and Angelo decide to cook a meal.
The next door neighbour Mrs. Fraser becomes obseesed with discovering the secret of Angelo's green fingers.
Rita and Angelo decide to go to a dance.
A group snapshot threatens to expose Angelo's secret.
Rita's mom comes to visit from Boston and Mike adopts a duck called Fluffy.
Mike has to learn cricket for his school team and Angelo decides to teach him.
Rita and Phillipa are busy planning Mike's birthday.
Angelo new invention brings chaos to the King household.
Angelo agrees to look after Philippa's pet.
Rita's mother is back for another visit.
Angelo takes classes on self defence.
Angelo starts hunting for ghosts.
Angelo meets Bob Bright, host of a TV talent show.
Angelo's friend Fuzzball comes to the King household.
Angelo makes a very potent hair tonic.
Mr. Pinner asks Rita and Mike to become part of the neighbourhood watch.
Mike's dad wants to take Mike back to the U.S.
Rita, Mike and Angelo return from their holiday in America and are looking forward to being back home. But suddenly Angelo begins to act even more strangely than usual.
Rita's mother arrives with a guest, her new fiancé Terence Creighton-Smythe.
Mike & Rita have a big fallout
Angelo's latest invention, a time machine made out of a shower cubicle, accidentally whisks Mister Pinner into the thick of the Battle of Hastings. At the same time, his ancestor, the lordly Sir Cyril de Pinner, is plucked from 1066 and plunked down in the middle of Rita's house.
When Angelo gives Brett Douglas a valentine's card, it sets off an amorous chain of events, as Brett believes that Rita is secretly in love with him.
Mike has a visit from his cousin, who does his utmost to get Mike and Angelo into trouble.
Brett is the victim of one of Angelo's crazy inventions.
Mike gets into trouble at school while Angelo gets hot under the collar.
Rita's boss comes round to give her a very important job as a television presenter. But it all goes wrong when Mike's friend Charles refuses to act pleasantly.
Rita's mother is depressed at the prospect of reaching 60 and is even more worried when she hears Rita and Angelo talking about getting rid of old things.
Mike and Rita's efforts to keep the truth about Angelo from Mike's grandma crumble when Angelo is discovered hopping around on the ceiling.
An escaped man-eating lion, a faulty door latch, and a Sony Walkman: three apparently disparate objects come together at the wrong moment to result in a day of unheard-of pandemonium at the King residence.
Angelo gets into star-gazing - but rather than take the roof off the house he does things the simple way by sloshing the ceiling with invisible paint. Simple, that is, until he accidentally tips a whole bucket of the stuff all over Mike, who promptly vanishes from sight.
When Rita's boss refuses to give her a raise, Angelo and Ellie resort to desperate measures.
Rita's mother reveals her secret past.
It's all change at the King household as Rita gets herself a new job and Angelo gets himself a new friend - Mike from the USA.
Rita has a blazing row with Angelo and tells him to go back where he came from, but in doing so Angelo finds himself stuck between two worlds. It's down to Rita and Mike to risk their lives to save him.
Drama student Katy Andrews returns to Mike and his extra-terrestrial friend Angelo's household after her disappointing trip to Hollywood. She discovers that Mike has become addicted to watching horror movies. Angelo tries to cure him.
Angelo turns to Shakespeare to help him write a sitcom.
Katy wants to give up acting, but Angelo has other ideas.
Katy hits the big time - selling used cars.
Mike and his new friend, Jodie, go camping.
As Mike's 14th birthday approaches, he learns that he has inherited a title from a distant uncle, and is now Lord Michael. Will Angelo, not known for keeping his feet on the ground, help Mike as he tries to do the same?
Angelo wrecks Katy's damp-ridden house so that the council will have to repair it.
Angelo panics and takes out a dodgy loan after he wrecks Katy's guitar.
Angelo breaks up the dance partnership between Katy's parents.
Angelo's interest in film production spells trouble for Mike.
Angelo's attempts to help Mike prepare for his big date leave him looking like a garden gnome.
Angelo is fed up with aliens getting a bad press and confides in a friend who works for the local paper.
Angelo makes some minor adjustments to his time machine and the trio end up in 1898.
Confusion reigns when Angelo comes face to face with his double.
An alien blob takes over Katy's body and threatens the earth.
Angelo enters a TV talent competition as a cowboy singer.
Mike tries to pretend that he hasn't forgotten Zoe's birthday.
When Angelo gets a new pizza-making machine, it brings him into direct competition with Sharkey.
Aunty Jeannie visits Angelo and awards him three magic wishes, but can he use them wisely?
With Mike Mason now living in America with his mum, Angelo and Katy are left alone. However next door, a new girl is staying with her Aunty Daphne Fawks Bently called Mickey. Mickey discovers wacky inventor alien Angelo, in his inventing shed and becomes friends with him. However, Daphne with knowledge of Angelo's personality refuses to let her niece ever talk to Angelo. Katy decides it's best if Angelo makes friends with their neighbour to allow Mickey to come round. Angelo organises a meal at his house with Daphne with Mickey and Katy at the cinema. The night starts of great until Angelo decides they both lay their hands in his Angelo Patent Pending Quick Dry Cement to keep their friendship. However the phone rings and Daphne is stuck with her hands in the cement by which time has hardened. Eventually Angelo free's her but Daphne refuses Mickey even to look at him. When Mickey hears this she runs away and is discovered by Angelo in his shed. Worried Daphne thanks Angelo for finding h
A salesman swindles Angelo, who decides to take revenge.
Angelo is very excited about a new magical board game he is getting. He opens it and rolls the die landing on 13. Suddenly a night in shining armour appears and demands a fight with Angelo to win the game. Mike gets turned into a small toy and is sucked up by Sammy, Katy's vacumm cleaner. He is eventually found and returned to his original size. The knight is scared off by Katy.