Alex Black (Then)
Black played Seth Powers, one of the coolest (yet also, the dumbest) guys at James K. Polk. An avid basketball fan, Powers was extremely dimwitted when it came to academics. Before “Ned’s Declassified,” Black got his start as Patrick Cassidy in “The David Cassidy Story” in 2000 and went on to star in “Bubble Boy” and “13 Going On 30.” He also made appearances on “Charmed,” “ER” and “CSI: Miami.”