"That's Summer Sausage, Not Salami" - Season 4

Charlie sets Alan up with their new neighbor, but he gets jealous when the two form a bond.

"Don't Worry, Speed Racer" - Season 4

Evelyn puts Charlie's house on the market without asking him, showing it to a wealthy, elderly Japanese man named Hiroshi. Charlie later catches Evelyn and Hiroshi naked in her living room together behind the couch.

"Castrating Sheep in Montana" - Season 4

Alan becomes involved with Berta's daughter Naomi, who has a newborn daughter of her own. This causes Evelyn to tell Alan during dinner with both families that she disowns him, until Naomi's boyfriend suddenly arrives, forcing Alan and Naomi to break it off.

"Walnuts and Demerol" - Season 4

Charlie's friends and family put a crimp in his plan for a romantic Christmas Eve date. When Evelyn sees who the date is, she goes to great lengths to force a wedge between them.

"Kissing Abraham Lincoln" - Season 4

Worrying Charlie may get rid of one of them, Berta and Lydia fight over him. Meanwhile, Kandi does everything she can to stop Alan from selling their condo.

"Corey's Been Dead for an Hour" - Season 4

Charlie gets tired of Alan's mooching and reaches the breaking point during the brothers' double date. Jake is left home alone for the first time.

"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.