In “By Dawn’s Early Light,” Patrick McGoohan is Colonel Lyle Rumford, overseeing a military academy whose enrollment has been steadily declining for years. When the scion of the academy’s founder announces plans to turn the institution into a co-ed prep school, the commandant sees fit to rig an antique cannon with C-4 and blow the guy to smithereens. Lt. Columbo is on the case, even bunking in with the young cadets (including a young Bruno Kirby!) and driving Rumford closer and closer to a confession. Michael Grasso (Hold My Order Terrible Dresser) is the guest.