S1, E22: Merlyn discovers that Lucas is not dead when she goes to the grave to question Lucas about Caleb's behavior. Because Lucas is not dead, the full potential of his evil powers are not yet recognized. Billy discovers from medical tests that Lucas is not dead. He and Ben dig up the casket before Lucas suffocates. Lucas does not want anyone to know that he is still alive. Meanwhile, Caleb is trying to find out the full potential of his powers by attempting to kill Gail, leaving him sole heir of Lucas' will.