Boom

Boom is a Decepticon from the Generation 1 continuity family.

Have you seen me?

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Boom is a Genericon who combines with his partner Sonic to form a piece of audio equipment.

Fiction

IDW comics continuity

Spoiler warning: Plot details for How Ratchet Got His Hands Back follow. Spoilers expire in 30 days

Pharma paid Sonic and Boom to get captured and claim to be Monoformers and once locked up together, they would transform and combine into their audio equipment alternate form and create a sound that would corrode those who heard it. Pharma covered this up as them being Decepticon prisoners and informed everyone they broke out during the Red Rust virus outbreak (which Pharma had caused). The two Genericons then cornered some Autobots including Pharma for revenge for being in Autobot custody for so long. These Autobots were saved by the sudden arrival of Fortress Maximus, who brutally slaughtered Sonic and Boom. Life After the Big Bang How Ratchet Got His Hands Back