That '70s Show

She was 14 years old, though the show required its actors to be 18.

Eric Forman was written out of the series at the end of the seventh season, as Topher Grace wanted to move on with his career.

Ashton Kutcher switched to a recurring guest role when he also chose to depart following the seventh season.

However, Kelso had not been written out yet, so to give better closure to the character, Kutcher appeared in the first four episodes of the eighth season (credited as a special guest star).

Wilmer Valderrama recalled: "When they made the decision — which was completely, 100 percent fine, because after eight years I think it's OK to say you want out — we looked at it and said, 'Do we still have a show?' And it's such an amazing ensemble.

Every single one of us has our character down, so we knew there were a lot of lines to explore." Both Grace and Kutcher returned for the series finale, although the former was uncredited.