I watched a (not so classic) Class of 1999 from 1990. It's in the midst of a lot of those 90s era "school" movies that 50s/60s kids who grew up seemed to love doing whether it was Principals/Teachers solving Gang Violence, Teachers Stopping Drugs, or movies like this where invaders from the outside take over a school and the teachers/kids have to prevent it.
It stars Bradley Gregg as Cody, Traci Lind as Christie (the Principal's daughter), Stacy Keach as Dr. Bob Forrest, Malcom McDowell (as the Principal. He filmed for 2 days and it showed, lol) with the 3 teachers being played by Patrick Kilpatrick, Pam Grier(!), and John P. Ryan(!).
Rough plot is the high school is set in Seattle, where gang warfare is high, and schools around the country have been tagged as "free-fire zones" where the police don't enter. Stacy Keach employs three robotic AI as teachers to study them for discipline, treatment, etc. Needless to say the teachers go rogue (aka AI learns OMG) and start legitimately killing students while the two gangs have to unite to save themselves and the school from the 3 teachers.
It's fine. I enjoyed it especially the last act where there's some really good robotic creature effects (and deaths) courtesy of All Effects Company with special effects/visual effects led by Eric Allard (who also worked on Short Circuit 1 & 2, Demolition Man, Mission Impossible, and Spy Kids).
5/10