9 Big Stars You Totally Forgot Were on 'General Hospital' (PHOTOS)

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Mark Hamill (1972-1973)

The future Luke Skywalker played Kent Murray, the nephew of Nurse Jessie Brewer (Emily McLaughlin).

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Elizabeth Taylor (1981)

Taylor portrayed the Cassadine matriarch and baddie Helena.

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Rick Springfield (1981-1983, 2005-2008, 2013)

Between his tours as a rockstar, Springfield has, on and off, played cool-guy Dr. Noah Drake, father to Patrick Drake (Jason Thompson).

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Amber Tamblyn (1996-1999)

Tamblyn starred as Emily Bowen Quartermaine, Jason’s (Steve Burton) sister by adoption.

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Jonathan Jackson (1993-1999, 2009-2011, 2015)

Before he appeared on Nashville, Jackson made a name for himself as Lucky Spencer, son of famed couple Luke (Anthony Geary) and Laura Spencer (Genie Francis).

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George Takei (1985)

The Star Trek star appeared as Mr. Diem, honorary mayor of Port Charles’ Asian Quarter.

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John Stamos (1982-1984)

Stamos played as Blackie Parrish, the foster child of Rick (Chris Robinson) and Lesley (Denise Alexander), known for his street smarts.

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Demi Moore (1982-1984)

The actress was Jackie Templeton, a reporter who fell for Robert Scorpio (Tristan Rogers).

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Ricky Martin (1994-1995)

Martin was singer Miguel Morez, a man who got tangled up in some baby-mama drama with Sonny (Maurice Bernard).

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General Hospital turns 55 on April 1, and to celebrate, we're taking a look back at all of the big names who have starred on the long-running soap.

Some were Cassadines, some were Quartermaines, and some were neither—but all of these actors got their big break when they landed in Port Charles. And we promise that many of these reveals will surprise you.

Click through the gallery above to relive some soap history.

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'General Hospital' Cast Members Look Back at Their Nuttiest Storylines (VIDEO)

You'd think Jason killing that many people would beat all. But nope!

General Hospital, Weekdays, ABC