Although the Man of Steel undoubtedly has his hands full with the Dark Knight in "Batman v Superman: Dawn of Justice," Black Adam has already lined up to take a shot at the Last Son of Krypton.

Action star Dwayne Johnson, who'll play the DC Comics villain turned antihero in "Shazam!," posted a photo of himself this morning clad in a Superman T-shirt, accompanied by the words "No capes."

The actor also included the hashtags "#BlackAdamIGKSDITD" "OneFineDay" and "#TethInTheBloodstream." While the latter is a nod to the Black Adam's alter ego, Teth-Adam, it's anyone's guess what the letters "IGKSDITD" mean. Of course, some of Johnson's fans are already offering suggestions.

"Shazam!" is set to arrive April 5, 2019. "Batman v Superman: Dawn of Justice" opens March 25, 2016.

No capes. #BlackAdamIGKSDITD #OneFineDay #TethInTheBloodstream pic.twitter.com/yDYln9eUxU- Dwayne Johnson (@TheRock) September 4, 2015