When the Star Trek episode 'Metamorphosis' needed someone to step in for the amorphous Companion on-set, costar Elinor Donohue was more than happy to oblige.
John Sturges was a crisis-averting machine, which came in handy when he faced an impending actors' strike while making his 1960 classic The Magnificent Seven.
The Halloween franchise has seen several sequels and reboots over the years, but there are a bunch of bizarre Halloween sequels that never came together.
Sam Rockwell's Green Mile character, 'Wild Bill' Wharton, is a real scumball, and Rockwell (plus some nasty egg white spittle) brought him to life perfectly.