Lost: Deus Ex Machina

Boone becomes concerned when Locke has trouble walking while they try to find a way into the mysterious hatch. But Locke is more concerned by memories of his parents and unlocking the cryptic visions he sees which leads them to a crashed drug-runners plane. In light of Locke's physical problems, Boone climbs into the plane's cockpit and discovers an working radio. He reaches someone with the radio just before the plane falls from its perch, severely injuring Boone. Sawyer turns to Jack for help with his crippling headaches, which Jack discovers is due to benign vision problems.