Watch the EW exclusive preview above.

This is Jackman’s debut onThe Simpsons, after previously turning them down due to a scheduling conflict.

“This time he was available and gave us an enthusiastic yes!

THE SIMPSONS

Hugh Jackman makes his debut on ‘The Simpsons’ as a singing janitor in the season 33 finale.FOX

In the episode, Jackman voices a janitor at the nuclear power plant where Homer works.

But then “gradually, it all went to hell,” as Jackman sings.

“At first we thought it was pretty funny.

THE SIMPSONS

Former U.S. Labor Secretary Robert Reich appears as himself on ‘The Simpsons’ season 33 finale.FOX

The Simpsons is a cartoon, after all, and the show’s relationship with money is very fungible.

Long continues, “but the more we thought about it, the more we thoughtThe Atlantichad a point.

There’s no way Bart will have that.

And we gotta get both Hugh Jackman and former Labor Secretary Robert Reich!

From there, it all kinda came together.”

Long’s not lying.

Watch the clip above, and catch the full season finale episode this Sunday on Fox.