Smallville's first episode, "Pilot" earned the broadcaster it's highest ever pilot ratings with 8.4 million viewers. However, the highest rated episode from the show overall and whilst broadcast on the WB was Season 2's "Lineage" with 9.4 viewers. Season 4's "Onyx" was the lowest viewed episode of the run with 3.85 million viewers. It was not until "Noir" from Season 6 in the CW run that the viewing figures reached lower than this number with 3.59 million viewers.
Smallville premiered on Tuesday for the first two seasons before moving to Wednesday for the third and fourth season before finally moving to a Thursday slot for it's final season on The WB which was then kept until the final season of the show.
- The CW Television Network, the second network that Smallville was broadcast on after the WB merged with CBS.