In 2270, Bachman was a member of a landing party investigating the surface of the Hollow Planet entity along with James T. Kirk, Spock, Leonard McCoy and Montgomery Scott. He became curious at the sight of bright green grass to see if it grew in soil, and he left a concrete-like path to scoop up a handful of it.
In response, small tentacled creatures emerged from small pillars, and one of them touched Bachman. He grabbed his chest in pain and collapsed, dead. The creatures then dragged his body away through a wall. When Kirk pursued, he fell through the wall and into free fall within the Hollow Planet. The entity at its core studied Bachman's body for a minute, then threatened Kirk. (TOS - New Visions comic: "The Hunger")