1963: Mystery Incorporated (1963 #1)

The first comic book in the "1963" series, this one features the introduction of "Mystery, Incorporated", a team which is analogous to the Fantastic Four, and involves the discovery of a mysterious masked intruder who invades their headquarters via an underground entrance called the "Miracle Mile". The four have to evade their own traps to find the mysterious intruder and fellow teammate "Kid Dynamo" whom ends up missing.