|Heroic Action Role-Play|
You have a hard time understanding and communicating with normal people; you are either too strange, too bestial or too stupid to understand human speech and behavior. Powers can be used to communicate with you, and you can talk to other creatures of a similar background - you can speak to others of your kind, but if 'your kind' is common in the campaign, this is not really a flaw at all. Otherwise you are entirely incommunicado. For stunts that rely on language, you have to use your Mind instead of your Charm and Impress skills; if speaking is critical the task automatically fails.
At double the points, you are also unable to read and write.
Dumb and Incommunicado are incompatible as limitations.