This is how General Grievous contacts Nightmare Moon goes in My Little Pony Transformers: Revenge of the Sith.
[We then see the escape pod heading for Equessokyo]
[The pod lands on a landing platform]
[General Grievous heads to the message room where he contacts Nightmare Moon]
General Grievous: Yes, Nightmare Moon.
Nightmare Moon: General Grievous, I suggest you move the Separatist leaders to Cyberfar.
General Grievous: It will be done, my lady.
Nightmare Moon: The end of the war is near, general.
General Grievous: But the loss of Lord Starkiller...
Nightmare Moon: His death was a necessary loss. Soon I will have a new apprentice, one far younger and more powerful.
Dan Phantom: A loss is a loss. Grow up, Grievous.
Nightmare Moon: Well said, Dan.
[The transmission shuts off]