When Adam is invited back to Sarah's place after meeting her at a concert it all seems too good to be true, until he's introduced to Sarah's dog, Wilfred. Wilfred offers him a bong and quickly sizes up Adam as a lightweight. Wilfred encounters Adam again during the night and has no problem coercing him into making nachos. Adam awakes from a bad dream, unsure of exactly what he's got himself into. When Sarah leaves to do some shopping Wilfred explains to Adam the source of Sarah's unhappiness. Adam tries to help by cleaning up the yard but a discovery spooks him into a panic. His attempt at escape is interrupted by Sarah, who easily convinces him to stay for dinner. Even Wilfred appears to be warming to Adam, providing him with a change of clothes and even accompanying him to the pub. Over a couple of beers Wilfred questions Adam's motives and reminds him that he's the one who'll have to pick up the pieces if he walks out on Sarah. Back home, some dinner, some TV and our young lovers already seem to be slipping into a relationship of convenience.

Adam and Sarah's relationship is blossoming. When things are at their best, Sarah takes the opportunity to tell Adam how important it is that he and Wilfred get on well. She gives Adam the 'single mum' speech-she and Wilfred come as a package. Adam convinces her that he loves Wilfred and to prove it he decides to spend some quality time with him. Wilfred is in his den - depressed. He's sleeping more than usual and he's gone off his food. He says he's very sick and "could be on the way out" - this may have something to do with the pizza Adam bought him the night before. He gives Adam a list of instructions of what to do should he die. Because Adam has done the "naughty boy" on Sarah - he is therefore obliged to look after her. Adam and Wilfred have a bonding session in the den - swilling beers and pulling bongs. Wilfred bemoans his lost tennis balls. A cheerful Adam offers to climb on the roof and retrieve them. In doing so, he falls and has to be taken to hospital. He wakes to find Sarah by his side. She tells him that Wilfred has been worried sick and has been fretting. When Adam arrives back home in a neck brace - Wilfred greets him with genuine glee. But this is short lived.

Sarah is aware of the growing tension between Wilfred and Adam and calls a meeting. She demands a ceasefire.Adam apologises to Wilfred and Wilfred says, "No hard feelings." It seems like they're all friends, but as soon as Sarah's back is turned Wilfred threatens to tear out Adam's throat. A silent but deadly psychological war is waged behind Sarah's back. The potential for explosive violence is at every corner. The brakes fail in Adam's car and he narrowly escapes a fatal car accident. Adam makes some extra lamb-chops and asks Wilfred to join he and Sarah for dinner. When Wilfred suggests they swap plates, Adam is reluctant. Wilfred grabs a stable table and takes his dinner into the den. Another scheme goes horribly wrong. Sarah slips on linseed oil and is knocked unconscious. Wilfred and Adam are faced with the possibility of life without Sarah. When she wakes up and has lost her recent memory, Wilfred and Adam tell an elaborate story of what happened to her, painting themselves as heroes.

Adam and Sarah are taking Wilfred to the beach. In the car, they talk about astrology - Wilfred doesn't relate to his starsign. At the beach, Adam and Sarah share some quality time together as Wilfred plays in the shallows. Wilfred returns and shakes water all over Adam - bouncing a tennis ball menacingly. Adam and Wilfred are in the water, throwing a tennis ball to each other. They drift further out - and away from the flags. They get caught in a rip and both start swimming desperately to shore. Wilfred catches a wave all the way into the beach, to the cheering of the sunbathers. Meanwhile, Adam is waving frantically. A siren goes off and two lifesavers grab a rescue board. They bring Adam back to shore and lay him down on the beach. Wilfred joins the crowd and watches as Adam is resuscitated. Later, Adam ties Wilfred to a table outside the surf lifesaving club despite Sarah's objections. They go in for a beer. They come out to find Wilfred gone, along with the table he was tied to. They search everywhere - then, go to the police. Adam is in trouble once again. Wilfred meanwhile pulls bongs in the back of a campervan with some surfers. Adam and Sarah arrive home late at night. Sarah is devastated, Adam is white. They go inside to find Wilfred and the surfers in the lounge-room watching DVDs and pulling bongs. Wilfred and Adam exchange a glare - this is war.

The doorbell rings. It's TV vet Jack Underwood. He has received Adam and Sarah's letter and has come to help Wilfred with his behavioural problems. Jack spends some 'one-on-one' time with Wilfred who is on his best behaviour. Jack and Wilfred get on like old mates and laugh at Adam as he cleans the back seat of his car. Wilfred shows Jack his latest hole - a crater he can stand in. Jack: 'This is a beauty. Did you do this on your own? Geez, you must've been going through a rough trot'. Wilfred convinces Jack that he is of sane mind and it is Adam who has social problems. Jack gives Adam a dressing-down and convinces Sarah to let Wilfred sleep on the bed. Sarah apologises to Wilfred, who is already making himself comfortable on the bed. Adam can hold his silence no longer. He is of the belief that Wilfred manipulates her, makes him look like a villain and is trying to come between them. Sarah has never heard of anything so ridiculous and refuses to choose between the two. But if she did have to choose...

Sarah sees an 'old friend' on TV. Adam and Wilfred, being on each other's wavelength, crack jokes about this 'old friend'. Their mirth comes to a grinding halt when 'old friend' Keith turns up on the doorstep. Keith is a well-known film star. Wilfred gives Adam a wry smile - "you got your work cut-out for you." At that moment, Keith introduces his dog, Cyros. Wilfred also has his work cut out for him. Keith introduces the game of 'totem tennis' to the backyard. Keith and Sarah play. It's competitive but fun. Keith then plays Adam. Adam is made to look very foolish. Sarah plays Adam. A fierce competition ensues. Adam is way too aggressive and freaks Sarah out. During the totem tennis games, Wilfred and Cyros have been bragging to each other. Wilfred: 'Ever caught a tennis ball hurled towards you at 79kms an hour?' Cyros: '89kms an hour. Cricket ball'. Keith suggests that everyone just chill out. He takes Sarah down the road to get an ice-cream. The conflict grows between the two factions. They are all vying for Sarah's attention. Adam and Wilfred devise the ultimate scheme. Their plan unfolds: Adam comes into the lounge-room in a 'body-builders' shirt with oil on his hands. He says he's off to the hardware store to get some six inch nails to fix up the back veranda. Keith jumps to his feet - and says he'll get the nails as he was heading down to the hardware store anyway. He and Cyros get in the pick-up truck. As they back out, there's a thud. Sarah and Adam run out of the house to find Wilfred has been hit. There's panic. Adam keeps a cool head and takes complete control of the situation - ordering Keith to get some ice and Cyros to get out of the way. Keith isn't convinced that Wilfred is injured. Sarah screams at Keith, "Get the bloody ice." A glum looking Keith and Cyros leave. Adam has his arm around Sarah as they wave goodbye to the visitors.