A cameo we're very excited about.
What is Alex Trebek on How I Met Your Mother?
The veteran game show host will appear on the Christmas episode of HIMYM, co-creator Carter Bays told TV Guide Magazine. Of the December 13 installment, he says:
"It's our twisted version of A Christmas Carol-type story. We see what it takes to get people back on track and start leading the life they're supposed to be leading."