Grace told reporters, while promoting his current film, "Win a Date With Tad Hamilton," that he and Kutcher wanted to leave when the current season ends, but decided to stay on for one more year.
Apparently Grace and Kutcher are not the only cast members with the need to leave.
"We're doing one more year and after that then we will probably be done," said Wilmer Valderrama, who also stars on the show. "After seven years of doing the same character, you sort of want to take a break."
The cast's contracts expire after the 2004-05 season, but a Fox spokesman would not elaborate on the show's future.
"It's been picked up through next year but nothing's been decided beyond that," he said.
"That '70s Show," which debuted in 1998, has been a favorite among young viewers.