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

Thank you so much, it really is a pleasure. While the boys chose a selection of songs that casts an eye inward on the irresponsible life choices and sexual hunger of today's modern teens we have chosen a selection of songs that speaks of the nation as a whole during these troubling times filled with economic uncertainty and unbridled social woes, because if there's two things America needs right now, that is sunshine and optimism! Also angels.

Rachel

I'm like a lizard. I need something warm beneath me or else I can't digest my food.

Santana