Supergirl “Medusa” Clip: A Thanksgiving Interruption

A preview clip has surfaced for Monday’s new episode of Supergirl, in which Kara, Alex, and associated friends and family are celebrating Thanksgiving around the table. James is about to out himself as The Guardian, and Alex is about to come out to Eliza Danvers (the wonderful Helen Slater)… but then there’s an intergalactic interruption from The Flash’s Barry and Cisco, who are trying to come through for the inevitable crossover.

Never a dull moment in National City!

This all kicks off the four-show crossover that begins with Supergirl on Monday. You can enjoy the clip from the episode, which is called “Medusa,” below: