Glee Promo: That's Neil Patrick Harris!

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Dream on.

That was likely the reaction most Glee fans had when they first heard that Neil Patrick Harris might guest star on this Fox hit.

He appears on How I Met Your Mother, they figured. No way this crossover would ever take place. But leave it to Ryan Murphy and his connections to make this dream casting a reality.

It takes place on next week's episode, aptly titled "Dream On." Get a look at Harris in the role of Will's former nemesis, Bryan Ryan, right now - and then check out the official promo for this monumental event below:

[video url="http://www.tvfanatic.com/videos/dream-on-promo/" title="Dream On Promo"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Glee Quotes

Quinn: Home for the holidays, just like we promised.
Finn: Guys, I...
Puck: Dude, if you start crying, I'm gonna kick your ass. Group hug!

You have seven months of your life left. Enjoy it.

Rachel [to Quinn]