Who are Ken Jennings, Brad Rutter, and James Holzhauer? That’s the question. The answer: They’re the three Jeopardy! champions who have won the most prize money in this history of this long-running quiz show – and beginning tonight, they show up in prime time special to identify the show’s all-time champion. And it’s hosted by the beloved, ailing, long-time host Alex Trebek, whose presence, along with those of the three contestants, makes this the evening&