STEM Flix is a STEM Video series for middle school classes created by the Northrop Grumman Foundation and Science Bob. The videos include demonstrations that engage the students and then explore STEM career fields and topics and how they are applied in everyday life.
There are two videos - Having Fun with STEM and Fun with Microelectronics - and the site also has instructions for doing experiments shown in the films, as well as fact sheets on STEM areas.
Related:
STEM (Science, Technology, Engineering, and Math) Resources for Educators