The Big Bang Theory is, at its heart, about relationships. The geek culture references, cameos, and science speak are dressings, and funny ones at that. But from the very beginning, the series set itself up as an exploration of relationships: the core four's interactions with one another; Howard's ( Simon Helberg ) one-offs on account of his objectification of women; Raj's ( Kunal Nayyar ) inability to start any with women due to his inability to talk around them; Leonard's ( Johnny Galecki ) unrequited desire to start a romantic one with the new neighbor, Penny ( Kaley Cuoco ); and, in turn, Penny's friendly one with Leonard; and Sheldon's ( Jim Parsons ) with his spot.

Over time, those relationships, and the characters themselves, matured and grew, extended to new a

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