Several Two and A Half Men actors have also appeared on The Big Bang Theory. The two Chuck Lorre produced series are among the most successful television shows of all time. Though not clearly set within the same universe both shows did at times reference each other in small ways. An obvious connection between both is some familiar faces from Two and A Half Men also appearing on The Big Bang Theory.Two and A Half Men aired for 12 seasons from 2003 to 2015 starring Charlie Sheen Jon Cryer and Angus T. Jones. The show revolved around Charlie Harper whose rich playboy lifestyle is complicated after his divorced brother Alan and his nephew Jake move into his Malibu beach house. In season 9 of Two and A Half Men Charlie Sheen was replaced by Ashton Kutcher playing billionaire Walden Schmidt who buys Charlies house after his death.
It is not unusual for producers to cast the same actors across different sitcoms. Sometimes these special appearances are a little bit more obvious like in the case of Charlie Sheens cameo appearance on The Big Bang Theory while others could have easily been overlooked. The Big Bang Theory was also produced by Chuck Lorre and was every bit as successful as its predecessor airing for 12 seasons from 2007 to 2019. The sitcom followed a group of nerdy socially awkward scientists who befriend a ditzy but street smart woman who moves in next door. Over the course of the show several actors made guest appearances including many who appeared as themselves such as Carrie Fisher and Mark Hamill. However some of the actors previously seen on Two And A Half Men also went on to portray different roles on The Big Bang Theory.
Sheen portrayed Charlie Harper the lead role on Two And A Half Men for the first eight seasons of the show before getting cut and being replaced by Ashton Kutcher. In The Big Bang Theory Sheen makes a cameo appearance in season 2 episode 4 The Griffin Equivalency. Raj is drinking alone in The Cheesecake Factory when he tells a random man at the bar that hes going to be in People magazine. The man turns out to be Charlie Sheen who tells Raj to call him when hes on the cover.
Vernee Watson Johnson
Character actress Vernee Watson Johnson best known for playing Will Smiths mother in The Fresh Prince of Bel Air appeared as a nurse on both Two And A Half Men and The Big Bang Theory. She was in the pilot episode as well as the unaired pilot of The Big Bang Theory as Althea a nurse working reception at the High IQ Sperm Bank. She appeared four more times in seasons 4 5 and 10 and in her final appearance aids in the delivery of Bernadettes baby. Althea is usually shown to be a sarcastic nurse judging Sheldon and his friends while addressing their medical issues. On Two and A Half Men Watson Johnson appeared as a nurse in season 1 when Charlie takes Jake to the hospital after he hits his head playing basketball and then twice again in season 9. She also appears in season 12 as an airport check in counter employee named Karen that Alan attempts to bribe. More recently she has played Nurse Robinson on two episodes of Young Sheldon.
Brooke DOrsay appeared as Christy Vanderbel an old friend of Pennys in season 1 episode 7 The Dumpling Paradox. Penny states that Christy is like family because she was engaged to Pennys cousin while also sleeping with Randall Pennys brother. In the episode she dates Howard on the condition that he buys her things until Mrs. Wolowitz forces him to break up with her. DOrsay appeared as two separate characters on Two And A Half Men first as Robin in a season 4 episode and then as Kate Waldens season 10 love interest. Walden meets Kate at the department store she works at while in the persona of a normal guy because he wants to find a girlfriend who doesnt want him for his money. They go on a few dates and Walden invests in her fashion line pretending that its Alans money.
James Earl Jones
James Earl Jones is best known as the iconic voice of Darth Vader and Mufasa from The Lion King. Jones plays himself in a season 7 episode of The Big Bang Theory where he meets Sheldon at a sushi restaurant and then invites him for a fun night out that includes visiting the carnival karaoke and ice cream. He tells Sheldon anecdotes about his life as an actor and they go to pull a doorbell prank at Carrie Fishers house. He also guest stars as himself in Two And A Half Men season 6 episode 11 playing the minister presiding over Charlies imagined funeral.
Brian Thomas Smith
Smith portrayed Pennys on and off again boyfriend Zack Johnson on The Big Bang Theory. Zack is shown as a foil to Leonard and often comes between Leonard and Penny. He is a dim witted and friendly guy who frequently tries to chat with the guys about science even though he doesnt know anything. Zack met Penny because his dads company supplied the menus to the Cheesecake Factory where Penny worked for most of the series. In season 7 its revealed that Penny married Zack in Las Vegas but they believed the ceremony was fake and had no idea they were legally married. In Two And A Half Men Smith briefly appeared as a character named Emmett in season 3 episode 16 Ergo the Booty Call.
Brian Patrick Wade
Brian Patrick Wade portrayed Kurt another one of Pennys dumb jock boyfriends on The Big Bang Theory. He appeared in three episodes in seasons 1 and 2 the first one being the pilot episode in which Penny sends Sheldon and Leonard to bring her TV from Kurts apartment only for them to return without their pants. Wade appears in a season 4 episode of Two And A Half Men as Sam a lifeguard who saves Charlie from drowning.
Sara Rue portrayed Dr. Stephanie Barnett a surgeon Leonard dated briefly in season 2. Howard attempts to date Stephanie by letting her drive the Mars Rover in Season 2 episode 8 The Lizard Spock Expansion. When Howard gets the rover stuck in a ditch he calls his friends for help which is how Leonard and Stephanie meet and hit it off. Stephanie is shown to be good at dealing with Sheldon in the subsequent episode and then in episode 10 Leonard attempts to slow down their relationship when he feels it is moving too quickly. The two break up at some point off screen before the following episode. Rue portrayed Bertas daughter in Two And A Half Men. In season 4 Berta introduces Charlie and Alan to her pregnant daughter Naomi. Naomi and Alan date in secret for a while and eventually break up when Naomi gets back together with her babys father.
Torresani played Claire in season 9 of The Big Bang Theory. She meets Raj and Howard at the comic bookstore when she overhears them discussing Frozen and enlists Rajs help with the science fiction movie script shes working on. Though she is just interested in his expertise as an astrophysicist Raj develops feelings for Claire. They date briefly in season 9 and she appears for one episode in season 10 along with Rajs other ex girlfriends. In Two And A Half Men season 12 episode 4 Torresani portrays Kathy a birth mother whose baby Walden and Alan want to adopt.