That opens the door for us to meet Leonards father, Alfred.

We knew we were in good shape.

As soon as Judd walked in, it just seemed right.

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Credit: Michael Yarish/CBS

Unfortunately, Alfred and Beverly do not have a good relationship, Molaro says.

Theres a little bit of tension; so much tension that even Sheldon picks up on it.

That tension is the last thing Leonard and Penny want after their first wedding didnt go as planned.

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Michael Yarish/CBS

In this particular finale, we dont really get that far.

The reason for that?

A cliffhanger involving Alfred, who will find common ground with Sheldons mother (Laurie Metcalf).

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Michael Yarish/CBS

An unexpected attraction springs up between Sheldons father and Leonards mother, Molaro says.

Theres a shared dislike of Beverly and a genuine fondness of each other.

Leonards father, it turns out, is a pretty charming guy.

Likely reaction from Sheldon: Joy over making a Brother Agreement.

From Leonard: Well,this.

The photo below may provide a clue.

The Big Bang Theoryfinale airs Thursday at 8 p.m.