Season 8 episode 20 of 'Big Bang Theory' titled 'The Fortification Implementation' will make viewers laugh to their hearts' content, as Sheldon and Amy take a big leap in their relationship in having a "platonic" sleepover.

Christian Today reports that in 'The Fortification Implementation,' fans will see Sheldon in a dejected mood as he has been neglected by people carrying out a physics symposium in a place which was once the residence of the late theoretical physicist Richard Feynman. Some bad memories are responsible for his depression, as Sheldon remembers the manner in which his own siblings counted him out from the forts they built as children.

As a result, Sheldon and Amy build their own fort, and decide to do their first massive move as a couple. But, it is not going to be just any overnight bash.

The official synopsis of 'Big Bang Theory' Season 8 episode 20 clearly states that Sheldon and Amy will have a sleepover, which has been described as "platonic." Hence, fans will definitely find it quite funny to see how everything turns out for the new couple, since it will be the first time that they would be doing such a thing. It will also make fans wonder how it will happen.

In the mean time, Howard will find things changing for him, as his half-brother appears from nowhere in the upcoming episode of 'Big Bang Theory' Season 8. In fact, Howard gets a younger brother even without the slightest idea regarding how or why his sibling comes to meet him.

Matt Bennett, who starred in 'Victorious,' will be seen as the long-lost younger brother of the aerospace engineer in 'The Fortification Implementation.' It will be interesting to see how the two brothers come closer by their mutual detestation toward their father who deserted their family. On a side note, all this happens in just within 10 seconds of knowing each other.

'Big Bang Theory' Season 2 episode 20 titled 'The Fortification Implementation' airs on Thursday, April 9, on CBS.