Charged with saving the life of Galactus, Mr. Fantastic found himself on trial in an extraterrestrial court room (Fantastic Four #262). In his defense, Mr. Fantastic made an appeal to alignment, more ore less. Because there is order in the universe, he argued, Galactus must be part of that order and therefore is truly Neutral. If that is the case, Galactus' actions as a devourer of worlds are not Evil but part of some greater Good. With the Watcher as defense counsel, Odin testified on behalf of Mr. Fantastic, comparing Galactus to a natural force like a super-nova or the solar wind.
I have a hard time seeing Galactus as Neutral in this way. It was Silver Surfer, a former herald of Galactus, who discovered that Mr. Fantastic was apprehended (#261). Silver Surfer could not attend the trial, however. As the Surfer reminded Invisible Girl more than once, he remained trapped on Earth due to the will of Galactus.
I could understand of Mr. Fantastic had argued that all sentient beings, including Galactus, have a right to live. But Silver Surfer's own words would contradict an interpretation of Galactus as naturally Neutral.
This page comes from Fantastic Four #261 (Dec. 1983).