HA! Doctor Zhivago!!! Out loud laughter as I envisioned it going down. Instead of the Doctor dying of health issues as he leaves the train, he gets jumped by a Ninja and gored mercilessly. He has the health to get there. Happy ending, right? Ninja No.
Do the ninjas have to somehow be incorporated into the existing plot of said movie or can they just slay the other characters in the first minute? If its the latter, my answer is Beaches.
Great movie, but it would be kick *** if when the Zulu warriors are overrunning the British fort if a group of Ninjas popped up for some close quarter fighting.
Karate Kid is already a great movie. But just think if a bunch of ninjas showed up to the All Valley Tournament and slaughtered everybody right before the final match between Daniel and Johnny.