Great KO scene of Storm from X-Men TAS. Beast injects her with a sedative to calm her down, which causes her to faint and loose consciousness.
Video: http://www.youtube.com/watch?v=aoxnysDm7iM
Source: dvd
The Scarlet Witch battles the villain "Necrodamus", and is KOed. This scene is from Avengers, Volume 1, Issue #128 (Marvel, October 1974)
Source: My Collection