Today is the big day! Dr. Oz begins his two-week run as guest host of Jeopardy tonight at 7pm on ABC! He called in to the big show this morbig preview this humbling experience.

Dr. Oz was close with Alex Trebek, their shows were in the same lot so they would see each other all the time, and Mehmet did the guest hosting to honor Alex. 

Dr. Oz is the 4th guest host this year, following Ken Jennings, Executive Producer Mike Richards and Katie Couric.

We asked Dr. Oz who he thinks should be the next host, and he thinks Richards would be great. "This guy is one of the most capable young executives i've ever seen in media" he says. "He's a handsome young leader, he understands the flow of the game and understands where America is."

And of course you can watch season 12 of “The Dr. Oz Show” weekdays at 1PM on FOX 5! Today's guest (3/22) is Giada De Laurentis, who gives a 3-day meal plan to reboot from an overload of carbs, sweets and wine! Plus Dr. Oz goes over the healthiest frozen pizza options.  

Go to www.DoctorOz.com for the latest!