The Sleeper

The Sleeper is the 1st episode of Season 11 in the original version of Hawaii Five-O

Synopsis
In a rare episode to delve deeply into native-Hawaiian culture, McGarrett and company are called in when an archaeological dig on The Big Island reveals secret tunnels headed underneath the ocean, which could lead to the grave of King Kamehameha I. Or at least somebody believes so, donning a royal robe and mask to frighten off -- and later kill -- two members of the archaeological dig. This is a rare episode in which the killer is not revealed until the end; in fact, McGarrett ...