The most controversial line of this period was the Pretenders. Pretenders consisted of a Transformer contained inside an action figure shell who could "pretend" to be either a human or a monster. Complaints with this line were numerous, including the lack of articulation of the figures (the shells could only move their arms), the simple transformation of the robots within, and their increasing lack of resemblance to any sort of modern recognizable vehicle. Still, despite the complaints, the Pretender line continued through all but the final year of Generation One, with variations such as Beast Pretenders, Monster Pretenders, Classic Pretenders, Mega Pretenders and Ultra Pretenders, each with variations on the theme or increasing levels of complexity.