We are a week away from the premiere of "Glee" season 5 episode 4, "A Katy or a Gaga." To keep fans on the edge the Fox hit series recently released some teasers photos of the upcoming episode featuring a swinging Adam Lambert.

In the promo featuring Lambert's character, Elliot "Starchild", the "American Idol" alumni is shown performing but we initially didn't know who the star would share the small screen with for the sexy duet until now.

According, to Hollywood Life, in episode 4 we will see Elliot audition for Kurt's band which will be an interesting sight, seeing as Lambert has been cast as a nemesis.

We also know he'll be singing a song with Santana however we don't know which song it will be just yet and from the title we can obviously see that the episode will be about Lady Gaga vs. Katy Perry.

We can confirm this because we hear Starchild singing Lady Gaga's "Marry the Night" in the promo video.

The photos also feature Adam Lambert swinging on a rope in Rachel and Kurt's apartment. Not to mention that we see Santana and Dani join the group to pick out an awesome name for their band which Santana insists she has come up with a great name.

Who knows what else is in store for this episode. If you needs little more insight about "Glee" season 5 episode 4, "A katy or a Gaga," check out the trailer below.

Click HERE for th new photos of "Glee."