To the Autobots, the Guardian robots are a reassuring sight, knowledge that they are safe. It was not always so. For the Guardian robots have a horrifying ancestor, the Dark Guardians, who enforced the reign of the Quintessons during their god-forsaken rule of Cybertron.
| This page uses content from Teletraan I: The Transformers Wiki. The original article was at Dark Guardian.
Forever is a Long Time Coming
Beta, A3's lieutenant, launched an assault on Hive City. The inexperienced Autobot rebellion fared poorly against the Dark Guardians, and numbers were against them. However, A3 activated the Coda Remote, bringing the Dark Guardians to a halt. The rest is literally history.
Since the third-season Aerialbot-time-travel episode never (yet) happened on the MUX, only Alpha Trion and a few others recall the horror of the Dark Guardians. Since the Dark Guardians pre-date the invention of transformation, they are not Transformers.