Plasma cannons are weapons which fire bursts of plasma at opponents.
The Axalon was equipped with a plasma cannon. When it became apparent that the ship was falling into an unnamed planet's atmosphere, Optimus Primal ordered that the plasma cannon be fired on the fleeing Darksyde. The blast successfully crippled the Predacon vessel.
Bumblebee's primary weapon was a plasma cannon, which he used to great effect against Devastator...as well as intimidating his former Sector Seven oppressors. During another fight, Mikaela told Bumbebee shoot with his plasma cannon while he is in a tow truck which he does, repeatedly blasting Devestator and killing him.
Bumblebee uses the same cannon to destroy the Appliancebots, who took the Witwicky house. Unfortunately, he destroyed half the house in the process. He later uses it to blast a hole into the Tomb of the Primes.
War for Cybertron
The plasma cannon is a chargeable weapon that can be charged in three stages. They begin to use up ammunition when you continue to hold the charge during the third level. This weapon also uses up ammo at an alarming rate and is best used a temporary weapon to deal out heavy damage to tough enemies and bosses rather than as your standard weapon. Also, Bumblebee and Breakdown are both seen using this weapon during cutscenes but do not come equipped with this weapon during gameplay.
- In the intro of War for Cybertron, Bumblebee fires a plasma cannon without having to charge it; instead it's fired like a machine gun.