Overview
Alien Arsenal is a 1999 made-for-television science fiction film directed by David DeCoteau. It is a loose remake of an earlier Charles Band production, Laserblast. It is also known as Teenage Alien Avengers.
Premise
Ralph (Josh Hammond) and Baxter (Danielle Hoover) are two high school nerds who are often tormented by bullies at their school. They find a secret chamber which contains a hoard of hi-tech weapons and armor, their superhero dreams become reality. They use these weapons to get back at the bullies as well as to fulfill some superhero fantasies.
But the alien owners are alerted to the discovery, and return to claim their property in a bid to use it to wipe out humanity. The aliens enlist the help of one of the bullies, Monty (Jerrod Cornish), to get the alien equipment back.
Monty and Ralph discover that they are both being used by the aliens to download an Armageddon Beam which will wipe out all human life on earth.
From Wikipedia (CC BY-SA 4.0).