Nemesis

The Nemesis is a legendary Decepticon warship, famous for being the Decepticon ship which ambushed the Ark.

Note: The Nemesis is never named in the original animated series nor in the Marvel comics, and was not named until Beast Wars.

Canon Cartoon continuity
The Nemesis was the ship used by the Decepticons to pursue the Autobots. All the Decepticons left the ship to board the Ark and both ships ended-up crashing on prehistoric Earth.

Before the crash, however, several objects were ejected from the ship, including an escape pod containing the future Insecticons and what would become the Pearl of Bahoudin.

Original Nemesis Crew Before the Decepticons boarded the Ark, the crew consisted of


 * Megatron
 * Seekers
 * Starscream
 * Skywarp
 * Thundercracker
 * Soundwave
 * Reflector
 * Spectro
 * Spyglass
 * Viewfinder
 * Decepticon Mini-Cassettes
 * Rumble
 * Ravage
 * Laserbeak

It's equally possible that Blitzwing, Frenzy, and the Conehead jets were also aboard the Ark, working in the background.

In 1985, archaeologists eventually discovered the wreck of the Nemesis in South America. Once Soundwave relayed the news to Megatron, the Decepticons deployed immediately. Upon arriving, Megatron removed the Nemesis's power-source, the Heart of Cybertron and had Hook then install it in him. Imbued with near-limitless power, Megatron then attempted to destroy the Autobots, and almost succeeded, until the Heart of Cybertron was removed from his body and destroyed by Perceptor, Brawn and Bumblebee.