It was the final story for production designer Ed Thomas. Although Davies did not explicitly make this point in his subsequent Torchwood: Miracle Day scripts, neither did he allow the Rift to be central to that series, as it had been to previous Torchwood outings. He said that closing the cracks in time also resulted in the closing of the Cardiff Rift. The Big Bang had an impact upon Torchwood as well, allowing it to, at least in Russell T Davies' mind, escape the confines of Cardiff.
While the identity of the Silence was a major topic explored in series 6, the question of why they wanted to blow the TARDIS up remained what the Eleventh Doctor called "a good question for another day" until the 2013 Christmas Special The Time of the Doctor answered it, while the mention of " an Egyptian goddess loose on the Orient Express in space" at the episode's end would later be picked up again in the series 8 episode Mummy on the Orient Express. The series 5 finale kickstarted several overarching stories that would foreshadow major conflicts yet to ensnare the Doctor. It concluded many aspects of the story begun in The Eleventh Hour - most obviously by marrying Amy and Rory and by seemingly closing the cracks in time - but it left the audience wondering what " the Silence" was and why it wanted the TARDIS to explode. The Big Bang was the thirteenth and final episode of series 5 of Doctor Who. You may be looking for the concept of a Big Bang or the specific Big Bang that started off the Doctor's universe.