OverviewEarth's climate changes are nothing compared to the quantum relationship shifts among the scientifically brainy but socially zany characters of the comedy megahit The Big Bang Theory. Lovebirds Leonard and Penny's impetuous Las Vegas wedding hits a speed bump as the guileless groom's bad timing with a prenuptual confession nearly puts a stitch in their hitch. Uberrational Sheldon and romantically minded Amy invalidate their "Relationship Agreement" - but the laws of attraction bring them back together, along with an unexpected birthday surprise. Howard and Bernadette shakily evolve into the next phase of their ongoing marriage experiment: pending parenthood. Perennial single guy Raj experiences a Valentine's Day to remember, wrestling over his attraction to - and dubious juggling skills with - two attractive gal pals. Indeed, therer are so many volatile elements in the air - including the infusion of would-be beaux, a dose of Stuart-separation syndrome, a feisty Meemaw visit and a climactic convergence of parental overkill - that all 24 Season Nine episodes will set you spinning out of orbit with hilarity and abandon.