Soundwave, the Decepticon communications officer and one of
Megatron's staunchest supporters, doesn't just master the frequencies that carry information across our planet, he revels in them. Stationed high in the upper atmosphere and capable of processing millions of data streams at once, he is fully capable of taking over communications on a planetary scale. Whether he uses this to direct civilization or destroy it remains to be seen.
Soundwave has two extremely powerful weapons: his spread of sonic cannons... and
Megatron. If any Decepticon crosses him, he does not hesitate to send a full record of said Decepticon's failures to
Megatron, almost certainly ensuring an untimely demise. His lofty position has made
Starscream suspicious, so
Soundwave has his minion
Ravage keep an eye on the Air Commander if he gets out of hand.
Soundwave is also nearly defenseless in space, as his devastating sonic cannons only work within the atmosphere.

In
Revenge of the Fallen,
Soundwave spends his time hovering above Earth in orbit. He receives a message from Wheelie about Mikaela Banes possessing a shard of the Allspark and orders him to retrieve it. Docking onto a satellite and hacking it, Soundwave intercepts information on the location of Megatron's corpse and the Allspark shard. He deploy his servant Ravage to retrieve the shard and sent the Constructicons to rendezevous at Megatron's resting place. After the death of
Optimus Prime, Soundwave carried out Megatron's orders to prepare the
Decepticons for the invasion of Earth. While coordinating attacks,
Soundwave located
Sam Witwicky's parents in
Paris, France, and called
Judy Witwicky via her cell phone. He demanded she tell him where
Sam was, but
Judy did not take him seriously, believing him to be a pervert caller, and hung up. He later intercepted calls from the Egyptian government on
Sam's location, and informed the other
Decepticons.
Soundwave did not take part in the last battle, although
Ravage did and was killed by
Bumblebee.

In
Dark of the Moon,
Soundwave is revealed to have been on Earth since the
1970s. He discovered the Autobot ship, the
Ark on the Moon, and recruited various human servants from the U.S. and Russian space agencies to prevent further exploration of it following the initial Moon landings, while he ordered a large army of
Decepticons to steal most of the pillars onboard and hide under the moon's surface. In the modern day he appears at Megatron's base in
Africa, where he and Laserbeak report the Autobot's recovery of Sentinel Prime and the remaining pillars from the crashed Ark.
Megatron praises
Soundwave's initiative in the decades-long plan and orders him and
Laserbeak to kill their human allies. The only human they don't kill,
Dylan Gould, has
Soundwave disguise himself as a
Mercedes-Benz SLS AMG that belonged to Sam's girlfriend,
Carly, in order to get close to the
Autobots. He reveals himself and captures Carly once the two humans learn of
Gould's alliance with the
Decepticons, and threatens her in order to convince Sam to discover the
Autobot's plans.
During the Battle in Chicago,
Soundwave and
Barricade lead several
Decepticons in capturing some of the Autobots.
Gould convinces
Soundwave not to take prisoners, and
Soundwave orders the others to execute their "trophies". Once
Wheeljack is dead, Soundwave prepares to kill Bumblebee himself, but a
Decepticon ship hijacked by
Wheelie and
Brains drops fighters near
Soundwave, distracting him as the Autobots began fighting back.
Bumblebee attacks
Soundwave who tries to shoot him, but is confused among the crushing ships and shoots the other
Decepticons.
Bumblebee killed
Soundwave by throwing an uppercut and sticking his gun in
Soundwave's chest and shooting. This caused
Soundwave's head to blast off, killing him instantly.
ALTERNATE MODES
Soundwave converts into a satellite that hovers above Earth. He is a Triple Changer, as he is able to transform into a Cybertronian jet as well.

In the third film,
Soundwave disguises himself as a
silver Mercedes-Benz SLS AMG. He has two sonic cannons that resembles a UZI.