THE SIMPSONS creators have ruled out making a sequel for the big screen, at least until the TV series ends, Variety reports.

Matt Groening and showrunner Al Jean were being interviewed at MIPCOM when they said a sequel would be unlikely since it was so exhausting making the series while producing the first film.

"It took 18 years to get around to doing the movie," Groening said. "We got very frustrated. We thought it would take two years but it ended up taking four. Some day maybe we'll do another one -- but don't hold your breath."

The pair made no prediction as to when the cartoon, which is now in its 21st season, might come to an end.

"We cannot predict the end because we can't believe we are still here today," Groening said.

Jean added, "We are contracted to do two more seasons following this one. I gave up predicting the end a long time ago."