Talk:Unused Godzilla: The Series Monsters/@comment-26567660-20150710013735/@comment-998602-20160313000509

"Certain Godzilla foes, such as Mothra, were unavailable as they were tied up in other rights situations. Another factor was the tight production schedule and the fact that it would be almost impossible to adapt one of the Toho monsters into animated form, send it to Toho for approval, and get it back in time to include in an episode. This facilitated the necessity to come up with over sixty new monsters for the series".

- Sci Fi Japan: The Ultimate Guide to Godzilla The Series.