"The Big Bang Theory" season 10 episode 20 is about Sheldon Cooper's lapses in determining the limit of his physical capability. It also tells about a new challenge in the life of first-time-mom Bernadette (Melissa Rauch).

In the episode, Sheldon (Jim Parsons) embarked on multiple tasks with his girlfriend Amy and other projects with Howard (Johnny Galecki) and Wolowitz (Simon Helberg). He tried to accomplish all the tasks in a span of one day which is beyond his human capacity as per Econo Times.

When he woke up after a tedious day, he was like disoriented and can no longer recall the events of the previous hours. In the promo, he asked how did he get in the place and what is going on. His friends looked at him with concern.

He then asked for the time and when Penny (Kaley Cuoco) answered 9 o'clock, he asked what happened to the seven and eight and the other o'clocks.

His tiring day has caused him to have a momentary lapse in memory which in turn caused his friends to bring him to a bar to revive his memory and they succeeded.

Bernadette has fully consumed her maternity leave and is faced with worry about her baby and how she will juggle her time for work and for baby Hailey. This will be a challenging time for her and if she passes it with flying colors then she has made another milestone in her life, said the above source.

Meanwhile, Johnny Galecki who is one of the major casts in the show was reported to have signed with Science Channel as per Stars Post. The network has ordered eight half-hour episodes of SciJinks. Many think that he will leave the show. But his new gig will not jeopardize his role as Howard in "The Big Bang Theory."