In the 1980 film Flash Gordon, one of Ming's servants is a golden ball that seems to be a droid of some kind.
It clearly isn't particularly loyal to its master, because as soon as Flash kills Ming, the ball droid congratulates him.
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Although the character isn't listed in the end titles, according to IMDB the character is known as...
...and was apparently voiced by Von Sydow himself, which would explain why the character does not receive a voice credit, despite speaking twice.
The film's official novelisation isn't much help:
At that point, the globe which had disintegrated the Lizard Man and Zarkov’s pistol flew into the room and halted in front of Flash. The victors tensed, Flash stepping before them.
“Hail, Flash Gordon, conqueror of Mongo!” said the globe.
Shouting with delight, Flash leaped into the air, and pandemonium erupted throughout the courtroom.