A 33 second promo for 'A Katy Or A Gaga' - episode 4 of 'Glee' season 5 - has been released, showing the first clip of Adam Lambert guest-starring in the show.
Hearing just a slither of Gaga's 'Marry The Night', Adam's vocals shine as always as he jams in a band alongside pop sensation Demi Lovato.
The episode will air November 7 in America and is expected to follow soon after in the UK on Sky One.
Check out the clip below. Are you excited for Glambert's 'Glee' debut?