Wilfred

Adam is invited back to Sarah’s place after a Powderfinger concert, where he meets Wilfred. Wilfred offers him a bong and quickly sizes him up as a lightweight. After a night of troubled dreams, Adam awakes unsure of exactly what he has got himself into. When Sarah leaves to do some shopping, Wilfred shows Adam the holes he has dug all over the garden, explaining that he has anxiety issues due to Sarah's string of failed relationships. Adam spends the day cleaning the yard. When Sarah returns, she easily convinces him to stay for dinner. Even Wilfred appears to be warming to Adam, providing him with a clean set of clothes and accompanying him to the pub. Over a couple of beers Wilfred questions Adam’s motives, and warns him not to leave Sarah like all her previous boyfriends have done. After dinner, Adam can't find his own clothes and Sarah gladly invites him to stay another night. In a post-credits scene, Wilfred is seen burning Adam's clothes.

Adam and Sarah’s relationship is blossoming. Sarah tells Adam how important it is that he and Wilfred get on well. Adam responds that he loves Wilfred and to prove it he decides to spend some quality time with him. Wilfred is in his den – depressed. He says that he is 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 says that if he dies, Adam will have to look after Sarah. Adam obtains the keys to Sarah's attic, where he and Wilfred have a bonding session – drinking beer, smoking weed, playing pool and watching porn. Later, Wilfred takes Adam on a mission to steal marijuana plants from an illegal plantation. Successfully back at home, Wilfred bemoans his lost tennis balls. Adam offers to climb on the roof and retrieve them, but in doing so he falls and has to be taken to hospital. He wakes to find Sarah by his side. Adam wonders aloud what a wonderful girl like Sarah is doing with a guy like him, but Sarah reaffirms that she loves only him. In a post-credits scene, Wilfred places Adam's wallet among the marijuana plants.

Tension is growing between Adam and Wilfred. Wilfred resents the fact that Adam is now spending so much time with Sarah, and Adam is convinced that Wilfred is trying to sabotage his relationship. A covert psychological battle ensues under Sarah's nose. Wilfred urinates on the toilet seat knowing it will get blamed on Adam. In retaliation, Adam successfully plays the hand in warm water trick on Wilfred, to grudging respect. Wilfred begins to dig up old dildos in the garden, prompting Adam to question Sarah about her opinion on sex toys. When Sarah cooks lamb chops for dinner, Adam attempts to lace Wilfred's serve with dog laxative. The scheme goes wrong and Sarah ends up in hospital, thinking she has eaten a "bad chop". Feeling better, she suggests that she and Adam should go dildo shopping – but her fantasy is not quite what Adam had in mind.

After Adam and Sarah come across an old video of Sarah's late ex-boyfriend Mark, Adam suggests that they take a day trip to the beach to help get Sarah's mind off it. However, Sarah takes them to the beach she and Mark often used to visit – this is not what Adam wanted. Adam goes swimming with Wilfred, but is caught in a rip and nearly drowns. He is rescued and resuscitated by a pair of surf-lifesavers, who admonish him for not swimming between the flags. Sarah is greeted by some of Mark's former surfing buddies, who are unimpressed with her new love interest. They return to the local general store for a beer, leaving Wilfred outside. Wilfred becomes frustrated with being ignored, and walks off. Adam and Sarah have had a good chat, but come out to find Wilfred gone. After hours of searching, and with the police no help, they drive home devastated after a disastrous day. Upon returning home, much to their relief they find that Wilfred is already there – Mark's buddies have found him and taken him home.

After Wilfred displays behavioural problems, Adam calls Jack Underwood, a reality-TV vet. Sarah has mixed feelings about this; she thinks it reflects badly on her as a dog owner. Jack, who evidently shares Adam's ability, talks to Wilfred. Wilfred convinces Jack that he is of sane mind and it is Adam who has the problems. Wilfred also leads Jack to believe Adam has been exposing him to second-hand smoke; Jack threatens to report him to the RSPCA. Adam can hold his silence no longer. He tells Sarah that Wilfred is manipulative and trying to come between them. Sarah has never heard of anything so ridiculous and refuses to choose between the two. When the show finally airs, Jack declares that Adam needs to "grow up" if he wants the responsibility of a pet.

Keith, a well known film star and "old friend" of Sarah's, comes to visit. He also brings his dog, Cyros – a younger and more aggressive hound than Wilfred. Wilfred and Adam both feel threatened by the two interlopers. Keith, Sarah and Adam play totem tennis in the backyard. Keith humiliates Adam, who then plays way too aggressively against Sarah and freaks her out. Meanwhile, Wilfred and Cyros brag in an ever-increasing game of one-upmanship. Eventually Cyros threatens to kill Wilfred and replace him in Sarah's life.Although Sarah is already beginning to tire of Keith's tall stories and self-absorption, Adam and Wilfred believe that they are being usurped, and concoct a plan to deal with the situation. Adam, acting unusually manly, mentions that he is going to the hardware store to buy some materials to fix the verandah. Keith predictably jumps at the chance to show-up Adam. As Keith and Cyros reverse out of the driveway, Wilfred feigns being hit by their car. Sarah rushes to Wilfred's aid, and snaps at Keith for being so careless. The pair leave the house in disgrace, and Adam and Wilfred regain their peace of mind.