Following last week's episode "The Leftover Thermalization", 'The Big Bang Theory' will be going on break until April 2 next month when it will return to air its 19th episode for this season. That episode will be titled "The Skywalker Incursion" and will revolve around Leonard and Sheldon's attempts at sneaking into Star Wars creator George Lucas' Skywalker Ranch.

The official synopsis, as provided for in this article at The Futon Critic, is as follows:

"The Skywalker Incursion" - When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Dr. Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong, on THE BIG BANG THEORY, Thursday, April 2 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

Following the 19th episode, the 20th episode entitled "The Fortification Implementation" will air the week after. This episode marks the first appearance of a new character in the form of Howard Wolowitz's younger half-brother Josh.

As reported in this article at The Hollywood Reporter, actor Matt Bennett from the television series 'Victorious' has been cast in the role. His character Josh will reportedly surprise the Big Bang Theory gang by showing up on Howard's house in an unexpected appearance.

The show had previously been operating on the basis that Howard was an only son, but the passing of Carol Ann Susi, who portrayed Mrs. Wolowitz on the show, opened up an opportunity to explore Howard's family in greater detail.

In an interview last month with The Hollywood Reporter, Big Bang chief Steve Molaro indicated that Howard's father could also potentially be introduced to the show. "It has not happened yet, but it's absolutely something that we think about."

Molaro added that it was unlikely that Mr. Wolowitz would be added this season, but it is a consideration for future seasons.