This season marks another major change in the series as Amber Tamblyn joins the cast as Jenny, Charlie's illegitimate daughter.

[3] In his absence, the series introduced Amber Tamblyn, who portrays Jenny, the illegitimate, lesbian daughter of Charlie Harper.

[8] Lynda Carter guest starred in the episode "Justice in Star-Spangled Hot Pants", playing a closeted lesbian version of herself.

Mila Kunis, Ashton Kutcher's wife, guest starred in the episode "Lan Mao Shi Zai Wuding Shang".

Though delighted to meet his long lost niece, Alan informs Jenny that Charlie is dead (which disheartens her a bit).

Evelyn invites Jenny to move in with her and her 91-year-old boyfriend, Marty (Carl Reiner), a wealthy retired producer.

Starting to crave their old relationship, Alan gets hurt when he asks Lyndsey over for dinner to meet Jenny and she stays home with her boyfriend.

Jenny comes in with another girl, followed by everyone from the beach bonfire, including Berta, who walks in and says she also joined the orgy (and had sex with James Franco).

Sweeney) to be incredibly friendly and supportive, and later accepts his invitation to watch the Los Angeles Lakers game from a luxury suite.

Jenny tries a couple of classes, but then quits again, leaving Walden miffed about the prospect of having "two Alans" in his house.

But the next day, Jenny announces she has landed an audition – the result of having drinks with a casting agent who turned out to be lesbian.

The next morning, Jenny sneaks both Robin and Lynda out of her room, while the oblivious Alan and Walden are on the deck apologizing to each other.

After watching Jenny pick up yet another woman at Pavlov's, Alan and Walden hit it off with the intellectual Jill (Spencer Locke) and the ditzy Laurie (Madison Dylan).

She claims that she rented it to enact his fantasy that she has an affair and then they have a threesome with Jenny (disgusting Alan, who is a tad annoyed that Lyndsey is doing something like this in front of him, in addition to cheating on him with Larry when they were together).

Walden and Rose check into a sleazy motel, apologize to each other for all of the grief between them, and ultimately end up sleeping together.

Larry calls Rose after learning that Lyndsey supposedly was not cheating on him and tells her that he does not need a private investigator anymore.

Meanwhile, Walden thinks that he is still a wanted man and ends up naked in the bushes outside his motel room while being pursued by the stoned manager.

Walden meets a beautiful girl named Nadine (Kate Miner) at a tech convention, but she reveals she is there as a model.

Meanwhile, Alan's evening plan of looking over some of Jake's old items inspires Jenny to take him to a gay bar where there will be horny, drunk straight women by night's end.

To Alan's surprise, Paula reveals that she was a man named Paul for 40 years, before undergoing gender-reassignment surgery.

Larry offers to set up his friend "Jeff Strongman" (Alan) on a date with a co-worker named Gwen.

Things start off good on a double-date, until Gwen (Brooke Lyons) is invited to a party and asks the other three to come along.

Walden feels empowered after finally having the guts to throw someone out of his house, so he goes home to tell Alan to move out too, but finds Barry already back there visiting.

Meanwhile, after playing party games with Larry and Lyndsey, Gretchen says she wants to spend some time with "Jeff" at his place.

After Kate leaves for a trip to San Francisco, Walden meets a hiker named Vivian (Mila Kunis) whose life is one outdoor adventure after another.

He, Jenny and Barry fly to Denver to look at it at a pawn shop, owned by a pothead named Dirk (Diedrich Bader).

Stopping in a motel, they get stoned on the pot they bought in Colorado and bond over good and bad memories about their dads.

Using Larry and Lyndsey's wedding cake and food, Alan and Gretchen have their ceremony at Walden's beach house.

Larry gets mad when he finds out that Alan and Lyndsey cheated on him, so Walden pushes him off the deck to buy time.

Sam Moore of Yahoo said: "Despite the criticisms and cast breakdowns, Two and a Half Men keeps surviving, and in my opinion, the show right now is the best it has ever been.