Corrected entry: Supergirl has X-ray vision, but never thinks to use it to figure out that Reign is really Samatha Arias under the mask.
wizard_of_gore
4th Feb 2018
Supergirl (2015)
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Correction: They have not specified what the mask is made of. It is likely lined with a dense element, such as lead, which Supergirl cannot see through. Just because we've not seen her try, doesn't mean she hasn't.