Shazam!: The Monster Society of Evil #1

Homeless kid Billy Batson follows a cloaked figure he believes is his father into a closed subway station. A train pulls up and takes Billy to meet the old wizard Shazam, who gives him the power to become Captain Marvel. After a trip to the Rock of Eternity for instructions from the old wizard, Billy and Captain Marvel return to Earth and encounter alligator men, who point to the first signs of the arrival of Mr. Mind, giant footprints in in the middle of the town's park.