Smallville :

When a student is pulled out of the school pool, having aged 60 years in a few seconds, Clark and Chloe decide to investigate. They discover an 80 year trail of similar events left behind by Chrissy "Missy" Parker, another student.

Because the farm is in financial trouble, Martha asks her estranged father, William Clark, for help. Clark is thrilled at the prospect of meeting his grandfather, but Clark's forced reunion doesn't go as planned because of an argument between Jonathan and William. Meanwhile, Lana discovers an old photograph that suggests her father may still be alive.