Daniel DiMaggio will make his first appearance as young Kal-El on episode thirteen of Supergirl, which airs Feb. 8.
Here's the episode synopsis -
"Kara's friends must find a way to save her life when a parasitic alien attaches itself to her and traps her in a dream world where her family is alive and her home planet was never destroyed. Kara's beloved cousin Kal-El joins her and her parents in domestic Kryptonian bliss, where neither of them needed to escape to Earth, or become super heroes. Also, Alex, Hank and the DEO must fend off a Kryptonian attack while Kara is out of commission." - CBSMovieweb has more below.
First Look at Young Superman in 'Supergirl'