Season 4 Episode 21 episode 21

Glee Season 4 Episode 21 "Wonder-ful" Photos

Glee Season 4 Episode 21 "Wonder-ful" Photos

*Read the guide for "Wonder-ful" right here!

Updated Gallery! Check down below for more new photos.

In addition to meeting Artie's mom (Katey Sagal) this episode, Mercedes is back! Check out photos for the second-to-last episode of season 4 of Glee - episode 21, "Wonder-ful" in our gallery below:

Source: FOX Publicity