Smallville, Episode 2.05: Chloe, Clark, and Lana
Chloe, Pete, Lana and Clark take notice of a love letter that Lana's received; she snarks that romance isn't dead. When Clark and Lana become suspicious of the letter writer - Chloe at first questions if Byron was a ghost as he declared dead eight years prior. Her digging turns up a scientist, Dr. Emil Jenkins,* who worked for Metron Pharmaceuticals and had Byron participating in a drug trial. Later, she figures out the link between Byron's sun-triggered strength and the drug trial, and reveals that Metron was bought up by LuthorCorp.
*Like Steven Hamilton before him, Emil Jenkins is most likely a nod to Emil Hamilton
