It's Dee Dee's birthday, and what she wants more than anything else is a pony. So Dexter decides to build her one in his lab. Dee Dee is delighted with the pony -- but then she wants it to fly. And talk. And play the radio. Before he knows it, Dexter has created a monster! Can he conquer his own invention... before it gallops crazily off into the sunset with his pesky older sister?
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