Penn & Teller star in a ‘Scooby-Doo’ cartoon, for real By John Katsilometes / RJ August 9, 2019 - 9:03 amAugust 9, 2019 - 4:48 pm Penn & Teller visited a haunted Las Vegas hotel on “Scooby-Doo and Guess Who” on the WB Kids network.