The CW site has officialy released a description for the upcoming episode on February 4th 2011 titled : Beacon .
Martha Kent Returns ! Clark (Tom Welling) is surprised to see Martha (Annette O’Toole) on the news speaking at a pro-vigilante rally. However, surprise quickly turns to horror when he and Lois (Erica Durance) watch as Martha gets shot on national television. Meanwhile, Lionel (John Glover) reveals himself to the world and reclaims LuthorCorp from Tess (Cassidy Freeman) and Oliver (Justin Hartley). Lois and Chloe (Allison Mack) decide to cheer Clark up by showing him videos from thousands of vigilante supporters professing their support for The Blur.
Another interesting thing happening in this episode is the return of another guest star who played young Alexander Luthor ( known to be portrayed by Michael Rosenbaum) in Season 6's Episode " Reunion ".
Lucas Grabeel will be reprising his role as seen in a brief video revealing Lionel Luthor talking with his cloned son .
So there you have it ,three famous characters from SMALLVILLE returns ! Martha Kent ( Annette O'Toole ) Lionel Luthor ( John Glover ) and the young Lex Luthor ( Lucas Grabeel )