According to TV Guide, Alexander will play Richard, a public school teacher who's suspended after he fails a student. The reason the character handed out an F? The student, Zack, called Darwinism "a crock."
Kathy Bates' Harriet Korn takes the case to court.
Alexander recently made a guest appearance on TNT's 'Franklin & Bash.'
'Harry's Law' premieres Sept. 21 at 9PM on NBC.
In other casting news ...
Heather Graham has signed for Rob Thomas' 'Little In Common.' Graham will play the wife of Rob Corrdry in the Fox comedy pilot about a set of parents who are united by their children's sport activities. Graham replaces Paula Marshall. [THR]
'Episodes' actress Mircea Monroe has booked a 'Hart of Dixie' guest spot. Monroe will play a woman from Wade's past. The character first appears in episode 7 and could recur. [TVLine]
Chris Zylka will guest star on 'Secret Circle.' The 'Shark Night 3D' actor will play Billy, a guy who broke Faye's heart. [EW]
'Boy Meets World' star Anthony Tyler Quinn has a new 'Pretty Little' role.Quinn, who played Mr. Turner on 'Boy Meets World,' will play an old friend and colleague of Byron on 'Pretty Little Liars.' [EW]
Eric Stoltz will star in Lifetime's 'Modern Love.'Stoltz will play a science editor with a crumbling marriage and fractured relationship with his daughter. He then unexpectedly becomes the editor of a love column. [Deadline]
'All My Children' actor Billy Miller has joined 'Ringer.' Miller will recur as Charlie, a man Sarah Michelle Gellar's character Bridget meets an a Narcotics Anonymous meeting. [TV Guide]
Bridget Regan, star of 'Legend of the Seeker,' will co-star in 'Hide.' The actress joins Carla Gugino, Mark-Paul Gosselaar and Kevin Alejandro in the TNT movie. [THR]