On Supergirl Season 4 Episode 12, Kara teams up with J'onn to help him find a missing man and is pleased to work alongside the DEO when the case coincides with Alex's.
It's Valentine's Day on Supergirl Season 4 Episode 12 and a heart-eating alien is creating chaos in National City. Kara joins Alex and J'onn to help stop the alien while the Children of Liberty rally behind Ben Lockwood.
On Supergirl Season 4 Episode 12, Kara decides to team up with J'onn on his latest P.I. assignment but it ends up tying directly into Alex's current situation.