Stuart Campbell invites Chloe Sullivan to talk to the hand. Crossfire 9x06
Linda Lake and Lois Lane - Infamous 8x15
I really enjoyed Linda Lake every time she appeared on Smallville. Campy fun.
Kara Zor-el Kent may not have been around to help Clark "fight" Doomsday, but she helped send Doomsday's mama back to the Phantom Zone. Bloodline - 8x08
There have been a lot of crazy doctors on Smallville. One of the most fun was linguist and expert in ancient languages Dr. Frederick Walden. Calling - 2x22