Lethal Weapons - S2.E7

Two criminals stop an armoured car, trying to break in. They bring with them a strange ray weapon, but grow impatient and raise the volume. The armoured car blows up and one of the criminals are killed.

Lambert watches the news and recognizes the weapon from the future. He goes undercover as an agent from the board of Alcohol, Firearms and Tobacco, recovers the weapon and interviews the surviving criminal, but the criminal doesn't know who sold them the weapon.

Lambert has an idea who made the weapon - a weapons inventor from the future. But before he can do something about it, he is attacked and left for dead. The weapon is stolen.

When Lambert recovers, he comes up with an idea of how to reach the inventor.

But the inventor and an associate is waiting for him, with a 21st century gauntlet ready. Can Lambert reach them?