Plot summary
With the wedding called off, Donna commiserates with Hyde at the water tower. After she accidentally knocks him off, Hyde ends up in the hospital, where nurse Kitty, researching his records, finds a different man listed on Hyde's birth certificate than the man Hyde had always thought was his father. Eric eventually returns, sneaking into Donna's bedroom to explain his disappearance, and Donna agrees she, too, was not ready for marriage.
Credits
Adapted from Wikipedia contributors, That '70s Show season 6. HTML formatting and reference markers removed.