Knowledge that the “Glee” journey ends in a few weeks might have removed some ambition from the creative process, but it has not rendered the series immune to change.

Change, in fact, is the theme of the Friday, February 13 episode.

Entitled “Transitioning,” the episode focuses on the concept of change — and addresses how it is impacting several key characters.

One such change involves the former Shannon Beiste, who returns in “Transitioning” as Sheldon. Other changes–and issues–are teased in FOX’s official synopsis.

“Will takes desperate measures to teach the bullies of Vocal Adrenaline about tolerance. Meanwhile, New Directions rallies to help Rachel transition into her new life when she finds out her childhood home has been sold in the all-new “Transitioning” episode of GLEE airing Friday, Feb 13,” says FOX of the episode.

To promote the episode, which will officially take “Glee” past the midway point of its final season, FOX issued some behind-the-scenes photos. Those follow: