Smallville Season VI - Episode XVIII

Chloe's mother, Moira, is confined in Lex's experimental facility 33.1, and her ability is to control anyone being meteor-infected.
Lex agrees to let her reunite with Chloe under the condition that she brings back an escaped meteor freak. Instead of bringing the man back, she commands him to kill Lex in defiance of Lex's order.
Chloe, under the control of her mother, obtains information which reveals Moira's location. With Clark's help, they rescues Moira from the facility, but without Lex's medicine, her mental condition deteriorates, and she is eventually reduced to a catatonic state. Lana finds her miscarriage is more complicated than she thinks.