This upcoming seventh season of 30 Rock will be the showâs 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 OâHara have signed on to pop up as guest stars when the show returns. The fun part, though, is that OâHara will be playing Kennethâs (Jack McBrayer) mom, while Cranston will play his momâs âfriendâ Ron. If you watch the show, you know that Kenneth is often telling stories about his momâs âfriendâ Ron coming over, a man that Kenneth is not too fond of.Itâs not too difficult to connect the dots that Ron is probably Kennethâs father, and I canât wait to see how the ridiculously talented Cranston and OâHara figure into the showâs plot. The 13-episode final season of 30 Rock begins on October 4th.