Final Season of Ultraman.

A global mass disappearing event takes place among humanity. Rena and Shinjirou simultaneously vanish. In the wake of these events, freelance journalist Kotaro Higashi investigates this mysterious "disappearance incident." The aliens behind it are the terrorist organization Dark Star. They transmit a message to those on Earth. "Give us half of the Earth, or sacrifice half of its people... make your choice." At the same time, the recently disappeared Rena and Shinjirou are teleported to the Dark Star ship orbiting the Earth. Learning too much, Koutarou is caught in the crossfire between Dark Star and the SSSP, and is almost left for dead.... In the final battle, our heroes face off against the Golden Fortress. Facing this giant mecha destroying the city, ULTRAMAN, SEVEN and TARO are joined by ZOFFY, JACK, and ACE. At long last the 6 ULTRAMAN heroes have assembled! (Source: Official Site)

The lives of three stunt pilots (Scott, Chuck, and Beth) are changed when they gain the ability to transform into three new Ultra-beings, and form the Ultra Force, to battle four giant Sorkin Monsters. (Source: AniDB)

Fifty years ago, an extraterrestrial giant of light known as Ultraman saved the earth but vanished. Ultraman's human host, Shin Hayata, was left with no memory of his time as a hero. Hayata's young son, Shinjirou, is found to have been born with a more powerful and durable body than any normal human. The organization who aided Ultraman, the SSSP, reveals Hayata's past to him. His father then dons a power suit again, assuming the role of Ultraman once more. One night, Shinjirou is attacked by an alien named Bemular and rescued by his father, who is severely injured in the battle. With dangerous aliens lurking in the city and Hayata out of commission, it falls to Shinjirou to pick up the torch. But in working with the SSSP as the new Ultraman, Shinjirou finds himself wondering how far is he willing to go to help people.