A New Beginning
Billy discovers this experiment and flees, ending up in a subway tunnel, where he meets the old wizard, Shazam, and gives the boy the power to turn into Captain Marvel when Billy says the old wizard's name (even Shazam feels this is familiar....and recalls the original Marvel Family, before trying to forget; but this issue is technically the first appearance of the post-Crisis Sivana and Black Adam, as well as Dudley Batson).
'S' Is For Wisdom...'H' Is For Strength
...with Black Adam and Captain Marvel having their first fight (though cut short), as well as Billy reuniting with Dudley to go to fight Sivana for Billy's money (and Billy getting a little help from Sivana's daughter, Beautia, who also hints at the idea that the evil scientist might have caused the death of Billy's parents!).
Beautia is also a post-Crisis version of her old self (and premiered in the previous issue), and had been famous for her charms, and affection for Captain Marvel, in spite of who her father was.
'A' Is For Stamina...'Z' Is For Power
At the subway tunnel, Captain Marvel finds Shazam's ghost, who explains how the wizard had exiled his former protege to another dimension, which Sivana brought the evil being back from.
Captain Marvel heads to Sivana's home to confront the evil scientist, but Black Adam interrupts. The two Shazam-powered beings are evenly matched, yet Sivana takes out the Captain with a weapon he had planned to use on Black Adam.
'A' Is For Courage...'M' Is For Speed
Captain Marvel finds Black Adam, and the two battle, coming back to Sivana's lab, with Cap changing back to Billy, and tricking Black Adam into activating the machine, which sends the evil one back into exile (though he eventually returns in DC's War of the Gods).
Captain Marvel frees hostages taken by Black Adam, gives Billy the credit for his finding them, which leads to Billy getting a job at the television station (just in time to see G. Gordon Godfrey begin his tirade against super-heroes that kicks off Legends....where we see Billy interviewing Godfrey on air).
Action Comics Weekly
Cap didn't even rate a cover appearance in this series, and Roy's version of Captain Marvel was mostly forgotten, even when Cap and Black Adam came back for Wonder Woman's War of the Gods...