In his home on quiet Howland Lane in Lakeside, Arthur Lake keeps the stone which holds Excalibur, King Arthur's magic blade, which Arthur found during a trip to England. (Apparently, US Customs was a little more lax back then?)
Whenever saboteurs or criminals come to town, Harbor patrol officer Arthur Lake draws the blade. There is a "tremendous peal of thunder, a brilliant crash of lightning," and he becomes The Sword.
When he does so, his friend Lance Larter is automatically transformed into Lancer, endowed with a sturdy lance and costume identical to that of The Sword.
Neither man has any superpowers, but each uses his weapon expertly.
This average action strip ran for three years, most of it in Super Mystery Comics.