"what doesn't kill you makes you stronger" follows the journey of four inseparable sisters, shruti, anushka, mayera, and kavya, as they take on challenges at different stages in their lives. cast: banita sandhu as shruti rajan katrina kaif as anushka rajan sonam kapoor as mayera rajan alia bhatt as kavya rajan fawad khan as imran qureshi chris hemsworth as tyler hawkins kareena kapoor as abigail malhotra avan jogia as david martinez