Opponents of Simon Parkes accused the 53-year-old of turning Whitby Town Council in North Yorks into a laughing stock with his outlandish beliefs and conspiracy theories about Government cover-ups, UFOs, non-humans and the IIluminati.
Earlier this year he claimed the armed separatist conflict in Ukraine had been sparked by an alien race called the Nordics advising Russian president Vladimir Putin.
Mr Parkes believes other space beings such as Reptilians, Mantis, Palladians, Tall Whites and "shadow creatures" exist.
He even appeared on ITV's This Morning back in 2013 to explain to Holly Willoughby and Philip Schofield why others like him should come forward with their UFO stories.
On Channel 4 documentary Confessions Of An Alien Abductee the same year he said his real mother was a 9ft alien with eight fingers.
He said he fathered an extraterrestrial lovechild called Zarka and added that making love with an alien up to four times a year has put a strain on his marriage to his human wife.
He told once a free-thinkers' group in Lancashire: "I prefer to call myself an 'experiencer' because I am neither abductee nor 'in contact'.
"I have a very clear memory in 1971 of making what researchers call a 'soul agreement'. To me it was just a bargain."
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Driving instructor Mr Parkes announced yesterday he was resigning as a Labour councillor for Stakesby ward because his workload left no time for his civic duties.
Mr Parkes said he would always be "proud" to say that he had served on the town council and said "others must now take up the challenge".
He revealed that he had not intended to stand for re-election in May but felt it best to stand down immediately.
Mr Parkes used to be a lecturer at the Natural History Museum and lived in London where he served as a local councillor until he relocated to Whitby in 1999.
Former Whitby Mayor and leading local Tory Scarborough councillor Dorothy Clegg said: "I don't think my real opinion of this is printable.
"Whitby Town Council should set its standards higher.
"They really do need to restore a more sensible reputation.
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"These wild stories are making them a laughing stock.
"This is my town and I have lived here for 30 years.
"I do not like to have people making fun of the place.
"It is his decision whether he steps down or not - but I do think the reputation of Whitby should be held as something precious and something to be proud of.
"It is beholden on everyone in the position of a councillor to remember that." Local vicar turned children's author Graham Taylor, who writes as GP Taylor, said: "I firmly believe this is a sad loss to local politics.
"He brought interest and merriment to a lot of people and did a very good job as a councillor, regardless of his beliefs in aliens."