Ultra Magnus generally appeared as a chief lieutenant to the leader of what fictional group of sentient robots? 
Ultra Magnus: Ultra Magnus is the name of several fictional characters from the various "Transformers" storylines, generally appearing as a chief lieutenant of Optimus Prime. Optimus Prime: Optimus Prime is a fictional character from the "Transformers" franchise. Optimus Prime:  He is the leader of the Autobots. Optimus Prime:  A fictional group of sentient robots that can transform into other forms (e.g: cars and other objects) He is the most iconic of the Transformers, being frequently featured in Popular Culture.
Autobots