The Simpsons Couch Gag Parodies The Big Bang Theory

While we don't get to cartoon version of Leonard, Sheldon, Penny, Wolowitz, Koothrappali, Amy, or Bernadette, Sunday night's couch gag for The Simpsons -- the longest-running scripted series in television history -- parodies The Big Bang Theory's memorable theme song.

The altered lyrics to the Barenaked Ladies' song include: "The whole Fox network was in a hot, dense state/Then nearly 14 billion years ago they began a TV show/Then Bart tried to sell his soul/Lisa turned to vegetables/Grampa started fighting bulls/Springfield built a wall (The Who played on the top)/Carl, Lenny, Barney, Moe and a fat, bald guy who hollers d'oh/That all started with the Simpsons (D'oh)!"

Back in a 2010 interview, BNL singer/songwriter Ed Robertson explained how the band end up writing and performing the theme song for the CBS sitcom. "[The Big Bang Theory creators Chuck Lorre and Bill Prad] contacted me and I had literally just finished reading a book by this British particle physicist named Simon Singh," Robertson shared with NewsOK. "The book is called 'Big Bang' … so it's a book that walks you through cosmological theory from the moment of the big bang up to present. I finish reading that book and then I get a call from Los Angeles from Chuck Lorre and Bill Prady, 'Would you like to write the theme song to a new sitcom called "The Big Bang Theory?"' I know, right? It was amazing."

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BART BEFRIENDS SPRINGFIELD'S GRANDMOTHERS - Bart gets in trouble on Grandparents Day at school and is forced to hang out with Skinner's mother as punishment. After spending time with various grandmas in the neighborhood, he learns the benefits of hanging out with the elderly, but eventually recognizes the dangers of taking advantage of them. Meanwhile, Peekimon Get has taken over the town of Springfield.

The regular voice cast features Dan Castellaneta as Homer Simpson; Julie Kavner as Marge Simpson; Nancy Cartwright as Bart Simpson and Nelson; Yeardley Smith as Lisa Simpson; Hank Azaria as Moe; Harry Shearer as Skinner; Tress MacNeille as Dolph; and Pamela Hayden as Milhouse.

Absolutely Fabulous star Jennifer Saunders makes a guest-voice appearance as Phoebe

The all-new "Looking for Mr. Goodbart" episode of The Simpsons airs tonight at 8:00-8:30 PM ET/PT on FOX.