The Miraculous Mellops

Episode 8 (1x8)

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The Grand Baby has only days to live, but attempts to reach Jane by telephone are hampered by Dump. Bill orders the kids to vacuum and Ralph is watching a dinosaur show on TV when his foot hits the power button and both he and the vacuum disappear. Ralph is nowhere around—instead he's clutching the vacuum cleaner and wandering in a primeval swamp of 300 million years ago, inhabited by giant dinosaurs.