Three weeks ago it was NBC's Matt Lauer making an appearance. Last night it was Larry King's turn.

The CNN anchor was at the center of the plot of "30 Rock" last night, as an interview with Tracy Jordan (played by Tracy Morgan) suddenly turned serious when the Asia markets began collapsing. King and Jordan had to navigate the breaking news together — with Jordan dishing out some suspect advice.

Click continued to see one of the King scenes, and Today's Meredith Vieira's short cameo as well...