Ro-Tor is responsible for reconnaissance. He isn't particularly fast in helicopter mode, but he has a tight turning radius and fantastic manoeuvrability. In addition he's almost soundless in flight, which allows him to sneak up on hapless Autobots and attack them from above. Ro-Tor likes to practice acrobatic flying in his free time. Ro-Tor combines with his fellow Combiners to form the giant robot Ruination.

(From Wikipedia)