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Buying goods from the comfort of home

Buying goods from the comfort of home

Sheldon competes with Wil Wheaton (guest starring as himself) for the role of the new Professor Proton when the scientist's old TV series gets a reboot. Penny looks after Halley when Howard and Bernadette are both put on bed rest

Sheldon and Bert collaborate on a research project, even though Sheldon is embarrassed to be associated with the study of geology. Penny and Bernadette coach Raj on how to navigate his fledgling relationship with Ruchi. Swati Kapila and Brian Posehn guest star

Leonard and Howard are furious when they learn that Sheldon went to work with the military behind their backs. Angered, the pair ask Kripke to help them get their own back on Sheldon, much to his annoyance. Meanwhile, Bernadette suspects that Ruchi might be trying to steal her job while she is on bed rest, so she asks Raj to investigate for her, putting him in a very awkward position. Dean Norris guest stars

The guys find a laptop that has some virtual currency on it. The only snag is, the computer belongs to Penny's ex-boyfriend Zack. Meanwhile, a seven-year-old video reveals a secret about Leonard and Penny's relationship

Sheldon and Amy try to eliminate stress from the planning of their wedding by applying mathematics to the process. Meanwhile, Raj 'breaks up' with Howard after realising that his best friend is actually damaging his confidence

Sheldon and Howard plan respective birthday celebrations for Amy and Halley. A letter from his brother makes Leonard feel anxious about his own lack of accomplishments. The series takes a mid-season break until the new year.

Sheldon and Amy subject their friends to a series of secret tests to find out who is most qualified to act as best man and maid of honour at their wedding. Penny realises her true feelings about her friendship with Amy

When Sheldon kicks Amy out of the apartment so that he can have some 'alone time' to work, she and Leonard bond during a series of science experiments. Bert the geologist replaces Howard in his band Footprints on the Moon, and Sheldon finds Penny to be a surprising source of scientific inspiration. Laurie Metcalf and Brian Posehn guest star

Peggy's bath falls through the ceiling and she reluctantly admits she might not have turned the water off. Meanwhile, more incidents as a result of forgetfulness cause further problems. Comedy, starring Billy Gardell and Melissa McCarthy

A prestigious writer's workshop in Iowa offers Molly a place, but as the house now includes Peggy and Carl, she struggles to find a way to break the news to Mike. Comedy, starring Billy Gardell and Melissa McCarthy

In the fifth season premiere, Molly returns home after eight weeks at the prestigious writers' workshop with exciting news - she is getting her book published and has received a generous advance. Comedy, starring Billy Gardell and Melissa McCarthy

Raj finds himself in the middle of a domestic drama when he realises that the woman he's dating, Nell, has a husband, Oliver, who is very upset about their new relationship. Sheldon rents his old room back to have a quiet place to work and drives Leonard crazy by being a model tenant

Sheldon petitions Wil Wheaton to allow him to appear on the new Professor Proton show, so the actor offers a guest appearance to Amy instead. Meanwhile, Penny gets angry when she thinks the female protagonist in Leonard's novel is based on her