Alex Trebek,80, signs off one last time as Jeopardy! host with tribute James Gordon For Dailymail.com The final-ever Jeopardy! game show hosted by longtime presenter Alex Trebek aired on Friday night. The final question: Dr. Margaret Todd gave science this word for difference forms of one basic substance; It’s from the Greek for ‘equal’ & ‘place’ 'What is Isotope?' came the correct answers from the show's contestants. Trebek signed off: 'Thank you, ladies and gentlemen, for spending the time with us. We'll see you again next week. It was the last show that Trebek ever recorded. Legendary game show host Alex Trebek posthumously ended his historic 36-year run as Jeopardy! host on Friday with his final episode