Following Ramona kissing him, Sheldon has flown to New Jersey to ask Amy to marry him in the realization that he wants Amy to be the only woman ever to kiss him. Before d ...

Amy has now started her summer research stint at Princeton. Much to Leonard's chagrin, he has reassumed many of the responsibilities for Sheldon that Amy had taken over w ...

Leonard, Sheldon and Howard, along with their closest friends and loved ones, are celebrating the near completion of the first phase of the military project, the three re ...

An event demonstrates to Sheldon that his cognitive abilities are weakening. This thought dismays him for many reasons, including the fact that his time to come up with a ...

Bert announces that he has met who he believes is his soul mate, a woman named Rebecca. The gang invites Bert and Rebecca to dinner at Leonard and Penny's so that they ca ...

Much to Amy, Leonard and Howard's chagrin, Sheldon boasts that he can work on their two separate projects in the same time that the three of them are working on one. That ...

Raj has now moved in with Leonard and Penny. Instead of a roommate for both of them, what Raj becomes is Penny's closest girlfriend, with Leonard feeling left out. It's n ...

Raj has posted on social media that he can no longer afford his apartment and is looking for a cheaper place to live. Independent of each other, both Howard and Bernadett ...

Sheldon, Leonard and Howard are looking over Raj's finances now that he has made the decision not to live off of his father. Despite Raj holding a good and steady job, hi ...

In the latest video chat Raj has with his father who still pays for Raj's every expense despite Raj having a job, Raj learns that Dr. Koothrappali has, in his own words, ...

The work on the guidance system is going smoothly enough, with the exception of Sheldon making one unnecessary suggestion after another just to satisfy his own sense of m ...

Sheldon is accused by his friends of being insensitive once again, this and most other times so accused because he doesn't read emotional cues in others. As Bernadette ha ...

Penny laments not only that Leonard no longer does romantic things for her like he used to before and when they first got married, but that he doesn't even seem to try an ...

It's early January, 2017, and Leonard and Penny are hosting a regular dinner for their friends, the first time they've gotten together since the holidays. Each group has ...

It's around midnight. Bernadette has gone into labor, with Howard, Raj and Stuart rushing her to the hospital. News of the labor makes its way back to their friends. It's ...

Amy tells Sheldon they need to remove some of Penny's things and bring some of his from the old apartment. Sheldon goes there and takes practically everything with no reg ...

Bert in the Geology Department has just won a prestigious MacArthur grant, and with it $500,000 which need not be used for his research. Everyone around him is happy for ...

Despite the parts that he doesn't like about it, Amy is able to convince Sheldon to take a skin sample from him so that she can develop a brain cell from a combination of ...

Sheldon and Amy seem to have found a comfortable emotional place in living together, they even hosting their latest webcast of Fun with Flags in their current abode of wh ...

Penny has been asked to appear at the Van Nuys Comic-Con for starring in the Serial Ape-ist movies. Leonard is able to convince her to make the appearance despite her hes ...

Sheldon and Amy are hitting obstacles in their five week cohabitation experiment, as Amy cannot put up with many of Sheldon's rigid rules, about which he will not negotia ...

A burst water pipe leaves Amy's apartment uninhabitable for five weeks. Penny and Leonard offer Leonard's bedroom as a place to stay for that time, while Penny and Leonar ...

With only two months to complete the contract for the Air Force, Howard, Leonard and Sheldon are working around the clock. Sheldon in particular is feeling sleep deprived ...

Howard passes along the fact that Colonel Williams wants to meet to discuss the guidance system to Leonard and Sheldon, the three and Raj who discuss amongst themselves t ...

It's the day of Leonard and Penny's formal wedding ceremony, but things have the potential to go horribly wrong because of all the interrelationships between the attendee ...

When she finds out that Beverly was secretly hurt by not being invited to their wedding, Penny makes the unilateral decision to hold another non-legal wedding ceremony to ...

Leonard's mother has come for a visit. While Leonard wants to avoid her at all cost, Penny wants truly to bond with her despite the less than happy relationship Leonard h ...

Penny has received tickets to a wine tasting, and has invited all her friends to go with her. Everyone accepts except Sheldon, who has no interest, and Bernadette, who ca ...

Leonard's mad at Sheldon for having to attend yet another useless quarterly roommate agreement meeting, on which Penny falls on Sheldon's side in wanting to keep the peac ...

Sheldon has been spending time in the virtual wilderness ever since Amy showed him a scientific study that proves spending time in the great outdoors significantly improv ...

Leonard and Howard have started working on the prototype, and accept Penny and Bernadette's offer to help. The boys leave the girls in the lab while they need to go to th ...

Alpha Emily continues to stalk, hunt and control Rajesh, over the objections of the new blonde barista. Meanwhile, Sheldon, Leonard and Howard REALLY need legal counsel t ...