Alex Begins Tests On Sam In New Supergirl Sneak Peek

A brand new sneak peek from the new episode of Supergirl has been released. This new episode is titled “For Good” and it will air tonight, January 29.

In this new clip, Sam questions Alex on her background in medicine before allowing her to run some tests on her. Alex tries to comfort Sam before running an MRI on her, but Sam’s nerves might be a little too high.