The episode “Kenny Dies”, the last in Season 5 of South Park, features some surprisingly helpful discussion of stem cells. The most user-friendly section is a 90 second clip when Cartman goes to visit the Alder Research Group to find out what stem cells are all about. You should be warned that, this clip aside, most of the programme is unsuitable for use with School groups and many older student groups are likely to include individuals who will be offended by much of the content. Readers with access to the British Universities Film and Video Council (BUFVC) archive should ask for the TRILT identifier 00186929.
Stem cells – short clip from South Park