NBC | 8:00 pm
As the title "One Hundred" suggests, the series marked its 100th episode with this tale, which also commemorates the one-century anniversary of Molly’s — possibly, since Herrmann (David Eigenberg) initially has doubts about throwing a big celebration for the occasion. Casey and Dawson (Jesse Spencer, Monica Raymund) hit a roadblock in trying to adopt Louie. Jeff Hephner guest stars. Taylor Kinney, Eamonn Walker and Kara Killmer also star.