The casting call description post was this at SpoilerTV.com:
[ANDREA POTTER] 35 - 55 yrs old. A heavyset, imposing and ruthless African American woman. She has sinister plans for the citizens of Metropolis... Do not limit your suggestions to heavyset. This role is established in Episode #912 but is a RECURRING GUEST STAR role.
Hmm, sounds very similar to the DC comic book character Amanda Waller, very familiar indeed, you heard it here first.
LEEE777 - I just love all these DC Universe appearances, this show's going back to being exciting!