Jackie and Sandra Corbett

Season One

 * "The First Face-Off" (first appearance)
 * "Two Powers Become One"
 * "Being Human"

Season Two

 * "Supernatural Tuesday"
 * "Walk This Way"
 * "Royal Pain"

Season Three

 * "The Love Cruise"
 * "Shapeshifter"
 * "Stop, The Presses"

Season Four

 * "Elementary"
 * "Exchange"
 * "Yesterday's Heroes"

Season Five

 * "Eye of the Templest"
 * "Big Brother"
 * "The Next Generation"

Season Six

 * "Parents' Night"
 * "Inside Freddy"
 * "Guilt for Free"

Season Seven

 * "No Girls Alone"
 * "First Stand"
 * "Bad Moose Rising"

Season Eight

 * "Partners"
 * "Furious Jealousy"
 * "Graduation"