"Watch the Xers expand again
They just grow on and on, my friend
We started out with just old Chuck
And the original Fab Five.
But then an island ate 'em
And to get them back alive..."

"Watch the Xers expand again
They just grow on and on, my friend
Chuck got six more mutants he dug up
>From all over the place.
Among them were a short Canuck, a metal guy
And a German with blue face."

"Watch the Xers expand again
They just grow on and on, my friend
They blew away the island
And they sent it into space
But even though the first bunch split
And another died while out on their first case."

"Watch the Xers expand again
They just grow on and on, my friend
Along came little Kitty Pryde
And the last she sure was not
The first batch became X-Factor
And the Morlocks died a lot."

"Watch the Xers expand again
They just grow on and on, my friend
Uncanny X-Men, New X-Men, New Mutants
And let's not forget Gen-X.
Excalibur and the Exiles
And you just know what's coming next."

(Restart from the top. Repeat until you have to duck thrown objects)