Clark gets a prophetic phone call and learns of Adam's (guest star Ian Somerhalder) plan to shoot Lana.
A bomb blows up inside a train station but leaves no trace of any explosive device; Peter and Olivia's investigation leads them to Iraq.
A guest goes missing as the wedding party prepares to head home; Abby gets a mysterious phone call.
The sheriff believes one of the wedding guests is responsible for the deaths on the island; a dark secret links Abby to Wakefield.
