"Release the Dogs" - Season 4

Alan suffers from insomnia. He visits his psychiatrist (Jane Lynch), who reveals that the cause of Alan's sleepless nights is his jealousy towards Charlie, and his inability to glide through life.

"Repeated Blows to his Unformed Head" - Season 4

Berta's daughter Naomi is pregnant and Berta drags Charlie with her when she confronts the baby's father. Meanwhile, Alan reveals a secret fetish while staying at the Harper house with Naomi.

"Apologies for the Frivolity" - Season 4

Charlie is dating a woman whose personality and life are like his mother's.

"A Live Woman of Proven Fertility" - Season 4

Alan is overjoyed by the prospect of Judith remarrying, as he would no longer have to pay alimony. Alan gets Charlie to help him when it looks like the marriage may be derailed due to Jake's dislike of his mother's fiancé.

"A Pot Smoking Monkey" - Season 4

Alan argues over the dog he and Kandi shared.

"The Sea is a Harsh Mistress" - Season 4

Charlie tries to surf to impress Dottie, a beautiful woman he just met, but after he nearly drowns he is convinced that he saw his late father.

"Who's Vod Kanockers" - Season 4

Charlie finally tells Alan the truth about why he did not marry Mia. Charlie and Alan deal with Steven Tyler, who has just moved in next door.

"Working for Caligula" - Season 4

Charlie returns to his bachelor lifestyle after Alan moves out of the house. Alan suffers a breakdown after his divorce from Kandi.