The episode title is a play on words to Generation X, a generation of people born between 1965-1975.

Billy Zane as Drake Demon (archive footage)

Nick Lachey as Leslie St. Claire (archive footage)

Anton: An ageless Warlock from the early 20th century who had a love affair with P. Russell, a past life of the Charmed One Phoebe Halliwell.

Coop takes Phoebe to see her past life as P. Russel in love with the immortal warlock Anton (referred to as a demon here by Phoebe) in the episode Pardon My Past. This is also the last appearance of a warlock on the show, and the last mention by one of the characters (Piper).

Tyler Christopher as Anton (archive footage)

Candor: One of the three members of The Triad

Eric Dane as Jason Dean (archive footage)

It was previously explained that demons could not physically enter Magic School on their own. Apparently, the Noxon demons were trapped by Leo in the dungeon to experiment in the students' advanced combat classes.

Jason Lewis as Dex Lawson (archive footage)

Victor Webster   (Coop) David Starzyk   (Carl Jenkins) Barbara Niven   (Helen Jenkins) Leland Crooke   (Candor) David S. Lee   (Rondock) John Rosenfeld   (Pator) James Immekus   (Ryan) Kimberlee Peterson   (Jen)

Two former students of Leo's from Magic School turn up at the manor to inform the Charmed Ones that demons Leo had imprisoned in the Magic School dungeons have escaped and are seeking revenge. Piper ends up helping the two teenagers, but it looks as if they end up saving Piper in the process. Billie's parents also return to see their long lost daughter Christy while Paige is off on her honeymoon with Henry and Phoebe travels with Coop the Cupid to visit her loves in her life as well as of a past life.

Alyssa Milano as Phoebe Halliwell

Rose McGowan as Paige Matthews

Holly Marie Combs as Piper Halliwell

Kaley Cuoco as Billie Jenkins

Julian McMahon as Cole Turner (archive footage)

The final scene in this episode is of Christy and Candor (the last remaining member of the Triad) in which Christy kills him and he mutters out "congratulations, you just passed the final test". This is almost exactly the same as when Cole kills Rainor in which Rainor mutters out something similar. This possibly goes on to support Brad Kern's statement of taking "the series out the way it began."^[1]

Cole's death shown in the episode Centennial Charmed was witnessed by an alternate timeline Phoebe, not the one we normally see on the show. When the timeline returned to normal in that episode, the Phoebe we know was unaware of the change, and did not even know that Cole was dead until she was told by Paige and visited Cole's apartment.