Series was originally slated to premiere on NBC
She will play overachiever Helen Stephens, who is wrongfully convicted of murdering her boss
The three actors will appear together in an episode titled "Under Pressure"
Meaner than old school Simon Cowell, Jenna trashes a kiddie contestant on the show-within-the-show "Kidz Got Singing"
Plus, Toni Collette, Bryan Cranston, Jeff Probst, Jerry Bruckheimer, Andy Samberg, Chris O’Donnell, Christina Applegate, Jane Krakowski, and Jeremy Piven