Replying...
Intro. In the Bayverse universe Soundwave and Shockwave were experimenting with a multiversal teleportation device. They immediately informed Megatron about this and they gathered all of the Decepticon soldiers in the Arena in the Nemesis (their ship) and Shockwave activated it. It blows up in a blur of light blue and entities from a different universe of themselves (the transformers one Decepticons)

Transformers bayverse and one Decepticons meet

@Daphy duck