A screen cap (or 'Screen capture') is when a still frame is taken from a video and saved. This is usually done in a single batch process, creating many pictures from a video file in a single process.
KP Screen Caps
For Kim Possible, forum member wallaceb has created a complete screen cap collection, not only of every episode of Kim Possible, but of many promotional and other KP related videos. He manages to have these captured and hosted on his fan website KPFW very soon after an episode has aired.