Clark must stop the school photographer after he sets up a fake high school and uses his ability to petrify people to kidnap students - including Chloe and Lana - to keep the glory days of high school going forever. Meanwhile, Lex and Lionel are kidnapped and tortured by the Teagues in an effort to find the Kryptonian artifact, revealing that...Lana has it.

A new kid in town named Charlie. Jackie tells Hyde she won't move to Chicago if he thinks they have a future.

Last night, the Final 4 sang their hearts out in hopes of winning America over. Find out tonight LIVE who will survive and who will be sent home. The contestant who received the fewest votes will be eliminated from the race for the coveted crown.

They capture the Sloane imposter question him about the Rambaldi orchird, but first the real Sloane must remember a painful memory, so that the fake Sloane will reveal where it is.

New Mythbuilder Grant Imahara joins the team as they recap old movie myths and test new ones in this special Mythbusters episode.

Keenyah wins a dance challenge where her belief that she is special irritates the other contestants; then she and Brittany get into a huge confrontation.

Next, the models pose and dance with male models. Keenyah stops the photo shoot when she feels betrayed by the one of the male models.

The team examines the murder of an avid Boston Red Sox fan found dead with a ruptured spleen following a tough loss against New York. Danny must put his baseball skills to the test to piece together the evidence as the CSIs try to find out how and why he was murdered. Meanwhile, after testifying in a murder trial, Mac is confronted by the defendant, Quinn Sullivan, who questions the validity of the evidence. Mac is torn between trusting science or his desire to help a man facing jail time who swears he's innocent. Also, when a truck kills a barely clad woman early one morning, the team investigates why she was running through the streets and from whom.

Les is airdropped onto a snow-covered peak in the Canadian Rockies courtesy of the Canadian Mountain Air Rescue Service. They'll come looking for him in seven days. Until then Les is entirely on his own, save for the grizzlies, cougars and wolves that also call this place home. To emulate a real-life survival scenario - in this case a heli-hiking expedition come to grief - Les has been provided with a few readily salvageable items, among them a broken camcorder and tripod. One man's trash is another man's treasure!

When Fontana and Falco investigate an arson which caused the death of a firefighter, they discover a murder weapon tied to a nine year old murder and a hate crime in which the defendent attempts to have his case dismissed because he became a born again Christian after committing the murder.

Jack suspects foul play when Michael becomes violently ill while building the raft. The suspects include Sawyer and Kate, who compete for the last seat on the raft and do anything possible to prevent each other from getting it. Meanwhile, a secret from Kate's past is revealed to the other survivors on the island.

TONIGHT: Star of "The Today Show", Al Roker. Plus, Lewis Black drops by with another segment of "Back In Black."