"On a daily rotation of 28 hours, the planet EM III cycles from radio waves to gamma rays." The teacher informed the class, "we live in the infrared and below. We can venture into the visible rays between 12 and 16 but never after." A student raised their hand. "Why not?" he asked. "Because, James, if we stay out longer, we would die."

Summary: The Enterprise is sent to survey the progress of recently reopened file: The USCSS Covenant. They will come to find out there was probably a reason the file was left unfinished... (K plus for not much more than graphic violence)