Gholos

The Golos was a gestalt species from Golos.

Biology
Golos took the form of a cloud of gas. It would change colour to suit the occasion; pink normally, red when scared or shocked and blue when attacking. This blue attack, known as "the blue sting of Golos", could easily kill a Human.

Golos was a gestalt entity, being able to divide itself into smaller forms. Spending time away from the gestalt was tiring and complete separation was deadly. It used a highly complex language to communicate. (BFA: Bang-Bang-A-Boom!)

History
The Golos and the Angvian empires were close to each other, leading to territorial disputes. The Angvians claimed their pastural colonies were attacked by the Golos, forcing them to go to war. Though peace treaties were made, the Golos eventually broke them. Likewise, a agreement about the Zordon Nebula was broken by the Angvians. This led to centuries of war.

Eventually, peace was wanted between Golos and Angvia. In order to prevent attacks from Angvian terrorists, two peace conferences were held. One was held on] Achilles 4, which was the obvious target. The second was actually the 309th Intergalactic Song Contest at Dark Space 8. The ambassador would have the political information telepathically hidden until they needed to know it.

Despite these measures, the secret got out. Loozly, the translator for the Golos competitor/ambassador, didn't want peace and tried to disrupt the Song Contest, killing people using Angvian methods. The Golos eventually learned the truth, but was unable to communicate it and threatened by Loozly with a special device. Eventually, the Doctor learned the truth and was able to get the device deactivated. When Loozly realized he lost, he tried to hold the Angvian ambassador hostage. Golos killed him, saving her and leading towards the peace conference. (BFA: Bang-Bang-A-Boom!)