Origin
Olar was a member of the Brethren race, created by the Celestials, used to wipe out other species. Olar was the longest lived of the group, but was killed by his own kind, before they actually made their way to Earth.
Creation
Olar of the alien race the Brethren was created by Bob Harras Tom Palmer and Andy Kubert , and first appeared in Avengers Vol 1 #338.
Powers and Abilities
In his humanoid form Olar could extend and control tendrils from his body, similar to how all Brethren could in their native forms.