Kit shook her head. "No, it lasted a long time," she said. "Long enough for everyone to start thinking that he was just a story."
"But yeah, when the animals rebelled against him, one of the cats locked him up in a coffin-thing, and he couldn't get out until he got Grune to help him. The animals all used to be Mumm-Ra's slaves, see. All except for the cats, who worked for him willingly. Well... mostly. And now I guess he wants the four Power Stones so he can make everybody his slaves again."
[Action]
"But yeah, when the animals rebelled against him, one of the cats locked him up in a coffin-thing, and he couldn't get out until he got Grune to help him. The animals all used to be Mumm-Ra's slaves, see. All except for the cats, who worked for him willingly. Well... mostly. And now I guess he wants the four Power Stones so he can make everybody his slaves again."