Martha Griswald and her family of bipedal, civilized saurian from Earth-99476 were visiting the Tower of London on a vacation when they were caught in one of Widget's dimensional portals. The Griswalds and their Beefeater tour guide were transported to Earth-616, populated by hairy mammals, while their alternate dimensional counterparts arrived on Earth-99476 in their place.[1]

The overly polluted atmosphere of Earth-616 unsettled the Griswalds' biology, causing them to devolve back into full-sized dinosaurs. Eventually, the Excalibur of Earth-99746 came to 616 and retrieved their citizens in exchange for the Griswalds of that Earth.[2]

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