We already got our first look at Amy's dress last week when she went dress shopping and nobody liked the vintage dress she picked out except Sheldon, who walked in on her and saw her. It would be bad luck if Sheldon believed in superstitious stuff like that, but luckily that isn't an issue here.
In addition to Bates and Teller, guest stars in the season finale will include Jerry O'Connell as Sheldon's brother George, Laurie Metcalf as Sheldon's mother Mary and Mark Hamill in an undisclosed role.
The Big Bang Theory's Season 11 finale airs Thursday, May 10 at 8/7c on CBS.
(Full disclosure: TV Guide is owned by CBS.)