NOTE: This article is about the incarnation of Scrapper from the Transformers live-action film series. The mainstream version can be found here: Scrapper (Transformers).
Scrapper as he appears in the live action films
Scrapper is a recurring antagonist of the Transformers Cinematic Universe. He is a Constructicon who transforms into a Catterpillar 992G front-end loader & forms the right arm of Devastator.
Biography
Transformers: Revenge of the Fallen
Scrapper is seen amongst Starscream's Decepticon group consisting of Long Haul, Rampage, Ravage & Bonecrusher (or presumingly a lookalike drone) searching for Sam Witwicky & Mikaela Banes. He is briefly seen in only 10 seconds trying to crush both of them with his mace after the two were exposed out of their hiding place. He, alongside Long Haul, Bonecrusher & many other Decepticons are killed in an airstrike.
Another Scrapper who didn't transform into robot mode was briefly seen forming the right arm of Devastator before being killed by a railgun.
Transformers: Dark of the Moon
Scrapper (or perhaps a lookalike drone) was briefly seen in the Battle of Chicago were he is the last Decepticon killed by Optimus Prime before he proceeded in killing Shockwave & fighting Sentinel Prime.
Gallery
Scrapper as temporarily seen in Revenge of the Fallen
Scrapper in the third film before being killed by Optimus Prime
Constructicon SCRAPPER Transform - Short Flash Transformers Series
Trivia
Scrapper has been confused with Scrapmetal, a Constructicon who trasforms into a Volvo EC700C crawler excavator & was killed off for spare parts for Megatron, due to sharing the same robot mode.
One early working design depicts Scrapper transforming into a Volvo front-end loader with a medic rank. It is possible Scrapmetal is loosely based from this Constructicon.
Scrapper forming Devastator's right is a remniscense to his Classics portrayal.