When National City is threatened by an alien super-computer who calls herself Indigo, Supergirl visits her cousin’s Fortress of Solitude for intel. Kara decides to leave the D.E.O. and take on the threat by herself, while Lucy and James’ relationship reaches a crossroads.

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SUPERGIRL DOES BATTLE WITH INDIGO, A DANGEROUS BEING WHO CAN TRANSPORT VIA THE INTERNET AND HAS A CONNECTION TO KARA'S PAST, ON "SUPERGIRL," MONDAY, FEB. 29

Laura Vandervoort Guest Stars as Indigo

REGULAR CAST:

Melissa Benoist (Kara Danvers/Supergirl)
Calista Flockhart (Cat Grant)
Chyler Leigh (Alex Danvers)
Mehcad Brooks (James Olsen)
David Harewood (Hank Henshaw)
Jeremy Jordan (Winslow "Winn" Schott)

RECURRING CAST:

Jenna Dewan-Tatum (Lucy Lane)
Chris Vance (Non)
Italia Ricci (Siobhan Smythe)
Briana Venskus (Agent Vasquez)
Jay Jackson (News Anchor)

GUEST CAST:

Laura Vandervoort (Indigo)
Patrick O'Connell (General Mathers)
Kelly Chavers (Girlfriend)
Ruben Vernier (Boyfriend)
Sebastian Velmont (Silo Guard #1)
Nick Jaine (Guy #1)
Carly Nykanen (Woman)
Michael Hanson (Guy#2)