Release Message:  A tragic car accident on the highway that takes the life of someone Clark (Tom Welling) loves, forcing Clark to appeal to Jor-El for help.

Description:  Clark reveals his secret to Lana, Jonathan and Lex learn the results of the senatorial election, and there is a tragic car accident on the highway that takes the life of someone Clark loves, forcing Clark to appeal to Jor-El for help. Wikipedia: In the 100th episode, Clark Kent travels back in time (a day earlier) to save someone close to him.