ByJessica Harmon, writer at Creators.co
The ultimate fangirl - spends most nights watching back-to-back old Buffy episosdes and complaining about being tired for work the next day.
Jessica Harmon

A new promo poster for the March 28 of Supergirl has been released.

In case you've been living without internet this past month you'll know that the episode guest-stars Grant Gustin as The Flash.

In the ep, The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home. The episode airs Monday, March 28 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

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