Well, Eren has never been seen really on TMS right? Wrong! Look at the Vendaface sketch in the Kaye Ballard show. On the bottom of Vendaface, there is a reflection. When the first two Muppets come out, (Zelda and Janice), we see her arms and the back of her head in the reflection. Then, when the Green Whatnot comes on, we see her head, and her headband, along with he working the Muppet's rod. It's quick, but, if you ever wondered what she looked like, check this out. You can also see her at the very end of Sex and Violence, performing Droop in the backround. Eren also might be that girl in the performers pit from "TMM" in the picture from the Works book. I'll find the page number later. Look for the girl in the pic with the dark hair. Just thought I'd mention this, since nobody has really actually seen her. RIP, Eren