Godzilla vs. Gargantua was a planned sequel to the 1966 film The War of the Gargantuas. The idea was scrapped due to it being too similar to Godzilla vs. King Kong.

The original plot was the monsters in War Of The Gargantua apparently got swallowed by a volcano, The evil green monster survives, but finds himself faced with another monster in the form of Godzilla.

A book that supposedly has godzilla fighting the monsters of "War Of The Gargantua"