My Science Project [1985] DvDrip

http://www.imdb.com/title/tt0089652/

In this sci-fi comedy, a high school hood, Michael
Harlan, procrastinates on his science project until
the day before it is due. Hastily seeking to rectify
his predicament, the youth begins scouring an abandoned
military dump and runs across a strange looking machine
with a large crystal orb. He has no idea that it
belonged to a shot down alien space craft and that it
contains not only the power to generate time warps, it
can also destroy the world. If he did, he might not
have turned it on. Unfortunately, he does activate it
and sends his entire class back in time. The special
effects are especially notable, as the kids roam Earth
from the dawn of time, to the future.


An oldie but still remembered.