This upcoming seventh season of 30 Rock will be the show’s last, but it looks like Tina Fey and co. are making sure they go out on a high note.  TV Guide reports the fantastic news that Bryan Cranston and Catherine O’Hara have signed on to pop up as guest stars when the show returns.  The fun part, though, is that O’Hara will be playing Kenneth’s (Jack McBrayer) mom, while Cranston will play his mom’s “friend” Ron.  If you watch the show, you know that Kenneth is often telling stories about his mom’s “friend” Ron coming over, a man that Kenneth is not too fond of.It’s not too difficult to connect the dots that Ron is probably Kenneth’s father, and I can’t wait to see how the ridiculously talented Cranston and O’Hara figure into the show’s plot.  The 13-episode final season of 30 Rock begins on October 4th.