Like father, like son. DC Titans goes supernatural in season 4 with Bosch star Titus Welliver as a God-like Lex Luthor dabbling in the occult in Metropolis.
DC Stargirl is crossing over to DC Titans in season 4. Brec Bassinger shared a photo from Toronto of herself with Ryan Potter as Beast Boy and episode 4×07 director Eric Dean Seaton.
DC Titans with Brenton Thwaites are back in Toronto to film season 4, but not as Gotham City. That arc ended in the season 3 finale.