Ratchet and Clank Future: A Crack in Time may be the titular duo's last adventure -- at least, for a while. Speaking with CNN, Insomniac's creative director for the game, Brian Allgeier, stated, "Never say never, but people need that closure. ... We hope to be wrapping things up with a bow."It seems unclear, from the comments Allgeier gave to CNN, whether he's referring to the franchise or just the storyline started in the Ratchet and Clank Future series. With 16 million copies of R&C games sold across seven installments since 2002, sales obviously have a lot to say when it comes to sequels. If A Crack in Time does well, we wouldn't be surprised to see the Lombax and his metal companion return within a couple years -- well rested and with some fresh ideas.Gallery: Ratchet & Clank Future: A Crack in Time