smallville Season VI - Episode XV "Freak"

A few abductions is reported in Smallville, with all the abductees being meteor rock infected and not remembering their abduction. Chloe and Clark delve into the issue and suspect that Lex might be accounted for this. They follow a lead to Tobias' house, discovering that he possesses the ability to identify meteor freaks. Chloe is abducted and sent back with some memorie erased, prompting her to realize that she is infected by the meteor rock, too.
Clark comforts her promising to look after her no matter what power she may develop.