Marissa Cuevas

Sheldon and Amy try to use maths to eliminate wedding planning stress. Koothrappali 'breaks up' with Wolowitz after realising he is hurting his confidence.

Chase, Adam, Bree and Leo discover that Sebastian has secretly formed an evil rebellion to exact revenge for his father's death by killing Davenport.

When Jack and Jerry save the lead singer of their favourite band, they become his bodyguards, but they find out that one of the other members of the band is out to get him.

Survivors of an alien invasion of Earth find a new way of determining whether someone is human or alien, a family comes to terms with a relative's gay wedding, and a couple of racists express some surprising views.

Jennifer feels jealous when Adam gets credit for raising Gretchen, even though he has not been responsible.

Manfred offers his services to Patience and Kai after witnessing a ghost attack a guest at the hotel. Fiji suspects supernatural causes when she discovers her plants have all died, and Olivia and Lem's psychic connection becomes a source of friction.