Fans are getting their first look at CBS’ Big Bang Theory, Season 11. A new teaser features a glimpse into the cliffhanger from Season 10. (It ended with Sheldon jetting to Princeton to propose to Amy after a coworker kissed him). In the new teaser, fans are seeing the moment in question which becomes suddenly even more complicated due to an unexpected phone call from Leonard. The show returns Monday, September 25th on CBS.