The Heisei Godzilla does not retain the heroic personality of the Second Generation Godzilla during the later Showa films, instead returning to the antagonistic persona of the original Godzilla. The Return of Godzilla and Godzilla vs. Biollante emphasized that Godzilla gains nourishment from sources of atomic energy like nuclear power plants, making his attacks on humanity something of a biological imperative, although he destroyed cities with less clear intentions during and following these films. In Godzilla vs. Mechagodzilla II, Godzilla began transitioning into an anti-hero character, adopting an infant member of his species as his son. In the last two films of the Heisei series, Godzilla battled against monsters that were purely evil and villainous, SpaceGodzilla and Destoroyah, while the human psychic Miki Saegusa insisted that Godzilla was actually an intelligent being with human-like sentiments. This is shown in Godzilla vs. Destoroyah, where Godzilla displays visible grief when Destoroyah kills his son.