Osmos V

Osmos V is the home planet of the Osmosians.

Ultimate Alien
Osmos V was first mentioned in Escape From Aggregor, Aggregor told Bivalvan, Andreas, Galapagus, P'andor and Ra'ad that he had built a machine on his home planet to let him absorb all their powers and that they were heading there before the aliens escaped to Earth.

In Ultimate Aggregor, Osmos V was mentioned again by Aggregor when he was ready to leave Earth, he told his robots to make a jump to Osmos V. When Aggregor was about to absorb the aliens, he told Ben's Team that he intended to take them to Osmos V.

Trivia

 * The name Osmos V comes from the word "osmosis", the process by which a solvent (e.g. water) diffuses from an area of a high concentration through a semi-permeable membrane into an area of low concentration. It is also the process by which cells absorb water and nutrients. This is a reference to Osmosians and their powers.
 * In Ultimate Aggregor, it was confirmed that Osmos V is Aggregor's home planet.
 * According to Dwayne, Osmos V is the fifth planet of its sun, Osmos.
 * As Aggregor was traveling from Aldabra to Osmos V, he passed Earth. This might mean that Osmos V is further away from Aldabra than Earth.
 * According to Dwayne, Kevin has never been to Osmos V.