As of 2009, two seasons have been produced, with co-creator Hagai Levi working on a spin-off program in a format similar to the Up series.
He visits the town with a film crew every eight years to see how the lives of these people have changed, a plot which parodies Up Series in Britain.
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He did similar work in England for the BBC and Associated British Corporation (London) and Granada TV (where he created the ground-breaking documentary Seven Up!) before embarking on a career as a feature-length film-making.
Futurama, the follow-up series from The Simpsons creator Matt Groening, began in March 1999, and was later cancelled (with its last episode aired on August 10, 2003) thanks to scheduling changes (the same fate met previously by Family Guy during its original run).
He is the co-creator with Robert Sabuda of the New York Times best-selling three-volume pop-up series Encyclopedia Prehistorica.
There was a follow-up series of 5-minute episodes shown in 1970 called The Adventures of Parsley, which featured all of the other characters from the original show.
In the follow-up series The Adventures of Parsley, Parsley does talk and is mostly seen with Dill.
His illustrations have appeared in Call of Cthulhu published by Wizards of the Coast and Scholastic Book's children's prehistoric creatures pop-up series.