Astrotrain is among Decepticons’ first Triple Changers, serving under Megatron as a strategic transport and heavy assault unit. 

Unlike standard Decepticons with a single alternate mode, Astrotrain can convert into both a spacefaring locomotive and a space shuttle, making him uniquely valuable for both logistics and combat deployment.

Functions as the Decepticons’ primary transport carrier, often used to ferry troops between Earth and Cybertron or across deep space. 

He plays a critical role in evacuation, reinforcement and large-scale movement of forces, famously jettisoning excess mass during dire situations, even discarding injured Decepticons when necessary.

Astrotrain is typically portrayed as sardonic, pragmatic and bluntly opportunistic. While loyal to the Decepticon cause, he is not above questioning leadership decisions, especially when survival is at stake.