Alex Trebek, who died Nov. 8 at 80, was admired as the longtime host of “Jeopardy!,” having helmed more than 8,000 episodes. But during his long career, the Canadian-born host also appeared on TV shows including “The Golden Girls” and “The X-Files” and emceed numerous other gameshows, including “High Rollers,” “Battlestars” and “To Tell the Truth.”