While the first wave of guest hosts filling in for late Jeopardy host Alex Trebek have yet to debut, the second wave has just been announced. Dr. Oz host Mehmet Oz, CNN's Anderson Cooper, Today's Savannah Guthrie and Dr. Sanjay Gupta were named as the next wave of guest hosts, according to Variety. Jeopardy champion Ken Jennings stepped in as the first guest host, and while he's still hosting current episodes, it's unclear when his stint will end. New hosts: Dr. Oz host Mehmet Oz and CNN's Anderson Cooper were named as the next wave of guest hosts, according to Variety