John Baxter and Brian Hannant's original script was called 'Time Wars'. Originally the city in a bubble was to be pursued by just one evil robot. However, producer John Daly of Hemdale Films insisted that there had to be hordes of robots to be featured in several battles. According to Hannant, these late revisions to the script combined with the lack of extra budget led to the failure of the picture.
The Time Guardian was the flagship in a ten picture deal set up with the Hemdale Film Corporation by producer Antony I. Ginnane. But when Hemdale pulled out of the production, the other nine pictures ended up suspended indefinitely.
The 2nd and final film directed by Brian Hannant. His first film as director was "Flashpoint" in 1972. And his 3rd and final film as a writer. He was the screenwriter of "Flashwriter" and the co-screenwriter of "Mad Max 2" in 1981.
Briant Hannant had been drawn to the rock formation at Wipena Point in South Australia while making "Mad Max 2". This inspired him to write a script with John Baxter in the early 1980s. According to Baxter the script was originally called "Time Rider", about a geologist who, while investigating magnetic anomalies around Wilpena, South Australia, encourages a man from the future, who is a scout sent back in time to find a home for his people, pursued by the Jen-Diki tribe.