Oliver was a telepath, and with this ability came access to the
Astral Plane, which he took full advantage of by creating his very own kingdom of sorts. However, as time went on, Oliver spent increasingly more time there, resulting in his entrapment within that plane for twenty years
[1].
When Oliver became trapped in the astral plane, his wife cryogenically froze his body. In the astral place he created a safe place which was a giant ice cube, a manifestation of his state in cryogenic stasis. As time went on in the Astral plane his memories and thoughts began to "drift" due to the lack of human contact.