Penny shares the celebration plan with Leonard.
When Penny puts together a second marriage celebration, she doesn't expect things to get as messy as they do. Alas, chaos ensues when Leonard's recently divorced parents, Alfred (Judd Hirsch) and Beverly (Christine Baranski), are forced to come face-to-face. To make matters even more interesting, Sheldon's devoutly religious mother, Mary (Laurie Metcalf), also joins.
Also, Howard and Raj convince themselves that the government is out to get them when they are contacted about their guidance system on the ninth season finale of The Big Bang Theory, entitled "The Convergence Convergence."