"The Godzilla Genealogy Bop", is a song from the Episode Godzilla vs. the Sea Monster. It's Joel's point of view in explaning how Godzilla was created, as well as other "Green" characters. It was written by Faye Burkholder and Kevin Murphy.
[On the Satellite of Love]
Crow T. Robot: I'm confused. Just who is this Godzilla guy?
Tom Servo: Yes, wise one, please, teach us.
Joel Robinson: I don't know if you're ready for this.
Tom Servo: (with Crow) Oh, please Mr. Joel. Please! Come on. Please! Please! Please! Please! Please!
Crow T. Robot: (with Tom) Oh, please! Please! Pleeeeease!
Joel Robinson: Okay, my little robot friends, but we only pass this way once. This is called "The Godzilla Genealogy Bop". Would you hit it, Professor Cambot?
In order to know Godzilla
We've got to look into his past
You know studying genealogy
Is gonna be a blast
Ah, you've got it little robot pal
We're swinging into high
Come on, let's cut to the chase you couple of geeks, and get to the family tree!
Well, it started with a nuclear blast
And pets that were released
TOM & CROW
--baby alligators and other nasty beasts?
Right. The fusion reaction caused them to grow
A thousand times their size
Well, that explains Godzilla's attractive tail and thunderous thighs!
Right. Now you're getting it little buddy
But now we must move on
Godzilla's not the only one
To benefit from the A-bomb
Yeah. Look, there's Aunty Ness from Scotland's Loch
They married in the spring
And their first-born was Godzooky
And now we begin to sing!
[Tom begins to scat ("Bop be du-bop! Be du-bidie du be du bop") in background]
Godzooky went to Hollywood
An agent to the stars
He had an affair with Lorna Luft
And smoked those big cigars
And outta the lusty Luft affair
Ron Perlman resulted
You know, surgery was considered for him
But nobody was consulted!
Then Ron met Yoko Ono
And they began to spawn
A couple of hundred horrible things
As green as Forest Lawn
But Ernest Borgnine isn't green!
Well, you put him on a boat and he is!
JOEL & CROW
Hey! Who's that at the bottom
A-wallowin' in his shame?
To wrap it up, the worst mutation...
No, you don't suppose?!
Oh yes it is, the horror of horrors--
--Karl Malden's nose!
- Although the song references Godzooky from the 1978 animated Godzilla TV series, the image is clearly of Godzilla's son Minilla.