John Churchill

Supergirl's powers are tested when Reactron (guest star CHRIS BROWNING), one of Superman's formidable enemies, arrives in National City and targets the young hero. Also, Cat plans to run an expose on Supergirl.

Grissom and Sara close in on who framed Hodges; a cargo plane lands autonomously at McCarran Airport and everyone on board is dead.

The team reviews the 1966 shipboard killing of a young woman previously thought to have jumped overboard; Maj. Kitchener (Daniel Baldwin) stands trial for running Rush's car off a bridge.