Before he was The Terminator, Arnold Schwarzenegger was approached by James Cameron to play Kyle Reese and actor Lance Henriksen was considered for the title role as the deadly T-800.
You can check out the original concept art for The Terminator featuring Lance Henriksen as the T-800 below, courtesy of the Core of Movies Twitter account.
James Cameron ditched his idea about having Lance Henriksen in the part as a guy who could fit in to having the muscle man Schwarzenegger take on the role after he suggested how the T-800 should act.
The Terminator reportedly came together from a fever dream that James Cameron had where a cyborg walked out of fire.