While Glee fans are buzzing over the appearance of Britney Spears on tomorrow night's episode, while also awaiting the songs New Directions will sing in her honor, let's not forget:

John Stamos also debuts on "Britney/Brittany" as Emma's love interest, Dr. Carl. In THIS CLIP, we watched him put Santana and Brittany under, leading to a "Me Against the Music" dream sequence. But let's rewind a few moments.

Below, readers can check out Stamos' first scene on the show, as he surprises Emma at work and interacts awkwardly with Will:

[video url="http://www.tvfanatic.com/videos/john-stamos-debuts/" title="John Stamos Debuts"] [/video]

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