Science fiction dramas have provided some of TV's most outstanding and often controversial moments over the decades. Think “The Twilight Zone,” “The Outer Limits,” “Star Trek” and its spinoff series or Syfy's “Battlestar Galatica” remake. “The Starlost” aspired to join that celebrated group of series when unveiled for syndication in the fall of 1973. Three top talents were united to make this venture go: Harlan Ellison, the acclaimed short story writer responsible a trio of classic TV episodes (“Soldier” and “Demon with a Glass Hand” for “Outer Limits” and “The City On the Edge Of Forever” for “Star Trek”); Douglas Trumbull, the “2001: A Space Odyssey” special effects wizard coming off plaudits for directing his first feature “Silent Running,” and Keir Dullea, co-star of “2001.” With that trio in place, 48 NBC stations and Canada's CTV network cast their lot with “The Starlost,” giving it early weekend primetime periods. So what happened?