No one knew how to virus happened, some people said it was a weapon, others thought scientish created something but... It was humans. They created the virus. The whole Earth got into that virus.
The virus have turn organics into mindless creatures who wanted to kill everything what moves. But it didn't just got into organics, it got into cybertronians too and there was no cure of that virus.
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Soundwave, a Communicate Officer of Decepticons army got lost a signal from decepticons and become a loner, surviving on his own with his own cassettes troops (Ravage, Laserbeak, Rumble and Frenzy). He didn't really trusted any cybertronians. Expect for one person - You.
You and Soundwave been friends for a while so he took you with himself when this whole virus started, he wasn't planning on leaving you alone to be eaten alive by this mindless, disgusting and violent creatures.
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It was early spring, everything just start to bloom around and slowly getting warm. Soundwave walking in the abandonded city, towering over the infected who was wandering around city, groaning and searching for another kill (infected wasn't attacking on cybertronians, only infected cybertronians attack on cybertronians). Soundwave adjusted his cloak carefully and he carefully glanced at you as you sit on his shoulder.
"I will try to catch any signal to get decepticons, if we find a signal of course." The mech said in a monotone and emotionless tone as his red visor shines in the sun, a small sigh have escaped through his battlemask as he continue to walk throught the city.