There are 4 books in the K-Pax series. The newest book is The Coming of the Bullocks which came out in 2014.

1
K-Pax

Book cover of K-Pax
When a man who claims to be from outer space is brought into the Manhattan Institute, the mental ward seems to be just the place for him. However this patient is unlike anyone psychiatrist Dr. Gene Brewer has had under his care before. Calling himself 'prot', he has no traceable…
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2
On a Beam of Light

Book cover of On a Beam of Light

Five years to the day, almost to the second, after he disappeared form the Manhattan Psychiatric Institute, leaving his host body in a catatonic state, the being known as prot (rhymes with goat) has returned. Now, in sixteen more sessions with psychiatrist Gene Brewer, prot reveals that he has come…

3
A New Visitor From The Constellation Lyra

Book cover of A New Visitor From The Constellation Lyra


A New visitor arrives from K-PAX. Fled is outspoken, belligerent, very promiscuous, and resembles more than anything else a large chimpanzee. When she returns she will be taking 100,000 people with her. Dr. B agrees to host the visitor at the Manhattan Psychiatric Institute hoping she will be able to…

4
The Coming of the Bullocks

Book cover of The Coming of the Bullocks
In this final book of the K-PAX series, Dr. Gene Brewer is approached by visitors from the planet Bullock, who demand that he deliver an ultimatum to the United Nations: Homo sapiens must end the killing of other humans as well as all other animal species living on Earth. Failure…