John Churchill

When four men go missing the BAU searches for a link between them in order to track them down. J gets upset when her son Henry doesn't want to celebrate Halloween.

A quadruple homicide shatters the serenity of a quiet suburban neighbourhood and Grissom's team sets out to discover the motive behind the bizarre murders.

A serial killer begins leaving clues to taunt Grissom; Warrick and Nick clash when they investigate a car accident.

When a woman's body is discovered in a missing showgirl's swimming pool, the team believes they've got a double murder on their hands.

Callen, Sam, and Nell set out to find pieces of a failed rocket launch and a top-secret government device. Meanwhile, Hetty attempts to help Keane with life in the States.

Supergirl's powers are put to the test when Reactron, one of Superman's most formidable enemies, shows up in National City.