Diplodocus (Seismosaurus) was a large sauropod dinosaur that lived in Late Jurassic North America. It could have reached a length of up to 27 metres (Diplodocus), though perhaps the oldest individuals and largest subspecies (Seismosaurus) could attain a size of 33-54 metres. Diplodocus may be the same as Amphiocelias, and there for it is the largest Sauropod that ever walked the Earth.

Walking with Dinosaurs

Diplodocus was the main dinosaur in Episode 2: Time of the Titans and the episode chronicles the journey of a young female from hatchling to adult. They face several dangers, including predation by Ornitholestes when younger, and, when older, Allosaurus is shown attacking them in packs, not unlike what they really did, according to fossil evidence. They also face a forest fire, and join a herd of adult Diplodocus, and mate.
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Big al attacks

Big Al and a colleague assaulting the Diplodocus herd

Diplodocus also appears in The Ballad of Big Al, again as a prey item for Allosaurus. Its main appearance was when Big Al was an adolescent, he and a few other Allosaurus made a pack and attacked a Diplodocus herd. They singled out a sick victim, and waited until the heat, and its illness, killed it. However, Al went in early, and was whacked by the neck of the Diplodocus.

In Sea Monsters - A Walking With Dinosaurs Trilogy, Diplodocus was one of the animals on Nigel Marven's time line.