While the other Autobots searched for the Matrix on Earth, Optimus Prime searched for Vector Sigma, guided through the dangers of the planet's catacombs by the spirit of Alpha Trion. Prime eventually arrived at the computer, only to find his way barred by Cyclonus and Scourge. At that moment, Hot Rod arrived with the Matrix, the same with which Alpha Trion merged, re-energizing it. The Matrix transformed Hot Rod back into Rodimus Prime and, for the first time, the two Primes fought side by side and defeated Galvatron. Before Rodimus could implement the Matrix to stabilize Vector Sigma, however, Optimus Prime merged himself with the computer, restoring its balance to save the planet. Optimus Prime sacrificed himself, dying again only a few short episodes after his rebirth. Later, Prime would make a final and permanent return in the Japanese Transformers continuity, "". This entry was only available in print, appearing in the "TV Magazine", a Japanese publication. Optimus Prime, Bumblebee and Spike Witwicky are the only main characters to appear in all of the seasons of The Transformers Animated series and survived throughout the show. Optimus reappears in Generation 2: Redux, a Botcon magazine which is set after the events of the final episode as a flashback where he led the first generation of Autobots to pursue Galvatron and Zarak in deep space.