I vaguely remember this television show from late night TV. It aired on Global in Atlantic Canada, around midnight. I don't recall any sort of theme, just the introduction, which lacked any mention of Elvira.
The theme was a catchy sort of song "The Killer B-Movies are coming.. thrillers and chillers, the Killer B-Movies are here" something like that.
The films appeared as episodes, one episode for each movie. Two were shown back to back.
The episodes I remember are "The Wasp Woman," "Monster from the Green Hell," "The Navy Vs. The Night Monsters," "Killers From Space," "The Brain from Planet Arous," and "The Giant Gila Monster".
They were rather entertaining and campy. "The Navy Vs. The Night Monsters" was my favourite. I liked them at the time, but I'm not sure I could watch them today.