What are the pros and cons of cooking a frozen holiday roast?

I know a lot of you are busy this Thanksgiving, but if you have the time I need your advice. I forgot to take my chuck roast out of the freezer and I’m supposed to be serving it along with the traditional Thanksgiving meal. Why we are having a turkey and a roast on Thanksgiving is a whole different issue…but I just wanted to know if anyone thought it was safe to slow cook it in the crock pot overnight without me making my family members sick. I’ve researched this on several different food sites and mostly everyone is saying it’s ok. But I want to know what all my fellow trusty-worthy flutherers think? :) Please answer – even if it’s after the holiday. Thanks!