Sound and Fury

Megatron creates Soundwave, a toy robot for Isaac to give to Sari for her birthday. Bulkhead is the only one who finds the toy to be a bad thing and discovers the toy is evil. Unknown to Sari, the more she uses her key on Soundwave, the more he will evolve into a bigger robot, which Megatron intends to use as a new body. However, after using the key many times, Soundwave becomes self-aware and assembles all the robots in Detroit to create an army. When the Autobots catch wind of Soundwave's plan, they try to stop him. Most of the Autobots get overwhelmed, but Bulkhead confronts Soundwave in the sewers. Soundwave tries to convince Bulkhead to his logic. Bulkhead tricks Soundwave and smashes him to pieces, but Soundwave survives as a cassette player.