PsychodelicateGirl

This is a problem I have been having for a year now, and have found no real way to handle it. Every few quarters I end up having be TA for a class that is taught by a really terrible professor, who my school more or less acknowledges is bad at his job. There are folders and folders of bad student evals from his classes, he is honestly become a joke in our department. But he is kept around because he is tenured and because he sits on financial committees. Anyhow-in order to make him as obsolete as possible in the department, he has been relegated to lecturing Intro level undergrad classes, which I sometimes have to TA for. His lectures are nonsense, he confuses dates constantly and he provides the TA's with no direction for the class. As a TA I have to run my own 50 minute break out section for his class, and I have truly nothing to teach my students. The last time I taught this class I ended up just talking to them for about 15 minutes about what was due for the class each week and trying to get them to talk about the material covered in the pointless lecture. All in all my class would last about 20-30 mins or I would end up canceling it, because there was nothing for me to do with them. I feel incredibly guilty about short changing them, but I can't think of anything to do with them and I have brought it up to my program's director, and he just shrugs his shoulders about the useless professor. Does anyone have any advice on how to handle being stuck TA-ing a utterly useless course? I considered running my own class with my own materials that the students could learn things from, in my section, but 50 mins once a week is not enough time to do this. Help!!