Just an idea. Think of a famous quote, like from another show or movie, and have characters from the ThunderCats cartoon saying them, changing details as necessary to make the quote apply to ThunderCats.
Mumm-Ra: Jaga never told you what happened to your father.
Lion-O: He told me enough. He told me you killed him!
Mumm-Ra: No, Lion-O... I am your father.