In the first season finale, weapons are found missing. This prompts Michael to put the post on high alert, deploying soldiers in response to this possible terrorist attack.

Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards.

Ray and Debra remember their days in their first apartment, she discovers she's having twins, and they decide they need a house. Ray maps a strategy where they are not close enough for everyday visits from his folks but not far enough for overnight stays. Meanwhile, Robert discovers his wife wants a divorce.

Kirsten hits rock bottom after Caleb's funeral, prompting Sandy to finally take action; Jimmy Cooper resurfaces and almost immediately renews ties with a mourning Julie; Jess bullies Trey into participating in a drug deal that turns into a shootout; Ryan finally learns the truth about what happened between Trey and Marissa, leading to a bloody confrontation.

An unstable woman stops taking medication and mows down 10 people with her car; a former rock star wages an anti-psychiatric drug campaign.

J.D. and Turk's college buddy Spence drops by for a visit and accidentally tells Dr. Cox a secret. Too much partying with successful Spence causes Turk and J.D. to show up late and drunk for work, which Dr. Kelso fully reprehends them for. Elliot's feeling low since she can't measure up to Dr. Kelso's standards, and the Janitor starts another feud – this time over paychecks – with J.D.