As the fourth season ends, Alan and Charlie's father issues surface when Evelyn's new boyfriend (Robert Wagner) befriends them and takes them to Vegas on his private jet. Hugo: Mike Connors. Rapper: Ian "Blaze" Kelly. Referee: Bob Rusch.

Penny's plans for a surprise birthday party for Leonard, who doesn't usually mark the occasion, get thrown off-kilter when Sheldon gets a chance to live out one of his biggest dreams.

Britney Spears returns as Abby, who is now dating Barney, and the pair, realizing how much they currently dislike Ted, decide to flaunt their romance in front of him at the bar. Barney, however, goes a bit overboard and does something impulsive.

Charlie falls for an older woman (Susan Blakely) who writes self-help books; and Alan and Jake fight about a school assignment. Jeremy: Coby McLaughlin. Mike: Jack Plotnick. Jon Cryer directed the episode.

Jeff makes a blunder when he sets out to help Adam and Jennifer buy an apartment in the building by recommending them to the co-op board, but he ends up making a bad impression on the president. Mrs. Westlin: Jessica Tuck. Nicky: Dylan Minnette.

A private investigator (Tom Sizemore) becomes Horatio's nemesis when he sets out to dismantle H's team piece by piece after a man's death is attributed to a phony 911 call.

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