Sheldon and Amy’s honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy’s parents, Mr. and Mrs. Fowler. Also, Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war.

Andy Kim, Bill Nye, Ciara Renee, Giovanni Bejarano, Kathy Bates, Neil deGrasse Tyson, Teller