Cliffjumper is an Autobot who originates from the Generation One continuity. In Transformers Prime, he was the first partner of Arcee, whom he was very close with. However, he was killed by Starscream and turned into a Terracron by the Dark Energon Megatron tested on him.
In the original series, he was voiced by Casey Kasem, who voiced Shaggy Rogers in the Scooby-Do, Where Are You? and Peter Cottontail from Here Comes Peter Cotton Tail.
In Transformers: Prime, he was voiced by Dwayne "The Rock" Johnson in "Darkness Rising, Part 1" (who also portrayed Spencer Gilpin in the Jumanji film series and Black Adam in the DC Extended Universe). In "Out of the Past", he was voiced by Billy Brown. In his Terracron form, he is voiced by Frank Welker (Who also voiced Megatron in the original series and Transformers Prime)