John Drew Barrymore (1932 – 2004) was originally contracted to play Lazarus (and anti-Lazarus) in "The Alternative Factor" , but didn't show up to work when filming began on November 16, 1966. Robert Brown was cast as a last-minute replacement. The Star Trek production team filed a grievance against Barrymore with the Screen Actors Guild over this, which led to Barrymore's SAG membership being suspended, effectively barring him from finding acting work, for six months. Herbert F. Solow and Robert H. Justman detail the incident in their book Inside Star Trek: The Real Story.