Anachronistic event

An anachronistic event is the term applied to a sequence of events that are out of sync with the normal flow of space time. In effect the event takes place in a different timeline.

Starfleet has encountered numerous anachronistic events during the 22nd, 23rd and 24th centuries, although the crews involved often have no knowledge of the events.

Stories Featuring Anachronistic Events

Star Trek: The Original Series

• "The City on the Edge of Forever"
• The Entropy Effect
• The Janus Gate trilogy

Star Trek: The Next Generation

• "Time Squared"
• "Yesterday's Enterprise"
• "Cause and Effect"
• "All Good Things..."
• Engines of Destiny
• Imzadi

Star Trek: Deep Space Nine

• "Children of Time"

Star Trek: Voyager

• "Time and Again"
• "Year of Hell, Part I"
• "Year of Hell, Part II"

Star Trek: Enterprise

• "E²"