Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.
Aquaman fights for control of his throne against Black Manta, whose son, Kaldur'ahm, is used as a double agent against Aquaman, but deserts and helps defeat his father. Aquaman mentions 'Lanterns'. Mera talks about the 'alien' in the surface world.
