Leonard returns from his research expedition in the North Sea early and undergoes an adjustment period with Sheldon. Howard experiences an unusual emotional reaction as a result of his relationship with his mother.
Sheldon and Penny bond as they miss Leonard, and Howard tries to help Raj get over his break-up with Lucy. Meanwhile, Bernadette and Amy visit an out-of-town conference where they are hit on at a hotel bar. Comedy about four high-achieving scientists
For the first three seasons, Galecki, Parsons and Cuoco, the three main stars of the show, received at most $60,000 per episode. The salary for the three went up to $200,000 per episode for the fourth season. According to their contracts, their per-episode pay will go up an additional $50,000 in each of the following three seasons, culminating in $350,000 per episode in the seventh season.