The fusion cannon is the signature arm-mounted weapon of Megatron, leader of the Decepticons in Transformers, which began as a toy line and animated series in 1984. Across cartoons, films and games the cannon has kept a recognisable charging whine followed by a heavy energy blast, making it one of the franchise's most quoted weapon sounds. Clips of the effect spread through fan edits, gaming videos and soundboards, where a single blast is now used as shorthand for overwhelming sci-fi firepower.