Shockwave (Generation One)

Shockwave is a recurring antagonist in fist two seasons of the Generation One Transformers cartoon.

Season 1
Appointed as Guardian of Cybertron by Megatron, the loyal Shockwave remained stationed on the planet for millions of years, even while his teammates slumbered on Earth. He was singlehandedly responsible for menacing the remaining Autobot resistance movements on Cybertron, and when Megatron was reactivated in 1984, assisted in the development of Space Bridge technology.

The Movie
In 2005, Shockwave may or may not have been killed during the events of the Movie, though either way he was never seen again afterward.