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Clench is the name of three fictional characters from the Transformers series first introduced in 1993. He was one of the leaders of the Decepticons. A toy of Clench was an exclusive available at Botcon 2010. Clench was also the name of a Mini-Con from the Transformers: Armada line, the partner of Galvatron.
Transformers: Generation 1
Clench was named the 23rd top unfortunately named Transformer by Topless Robots. 
Clench made his first IDW Publishing appearance in the second issue of The Transformers: Megatron Origin. Appearing as the presider of the gladiatorial games, he ordered a hesitant Megatron to finish off his opponent, Cy-Kill. Megatron would later allow Clench to be destroyed in another match, and seize control of the gladiatorial games.
- Generation 1 Obliterators Clench (1993)
- A new mold.
- Generation 2 Obliterators Colossus (1994)
- A repackage of the initial character under a new name.
- Timelines Ultra Clench (2010)
- A BotCon 2010 exclusive, this figure is a remold of Universe Ultra Onslaught in Clench's Generation 2 blue and pink colors.
In the Japanese storyline Clench is called Spark Barrel, and is simply an upgraded form of Barrel, the Mini-Con called Leader-1 in the US.
Following Megatron's transition to Galvatron, Clench took over Leader-I 's duties as the Decepticon leader's primary Mini-Con. When the powered-up Galvatron found himself dissatisfied with the power boost that Leader-I could provide, he dismissed his tiny partner in no uncertain terms and embarked on a quest to possess the most powerful Mini-Con for his own personal use. Finding nothing he deemed worthy, Galvatron decided to forge the ultimate Mini-Con out of existing parts donated by unwilling victims. The striking physical similarity to Leader-I has led many to wonder if Galvatron initially selected Clench for upgrading because the new Mini-Con was genetically related to the Decepticon leader's former partner. Leader-I refuses to confirm if Clench is his brother, but it is obvious that being replaced by his identical twin has only enhanced his misery. The aggressive Clench is utterly loyal to Galvatron and lives only to serve his master's needs; he's so grateful for his amazingly powerful body that he devoted himself to the Decepticon cause. He has no sympathy for his fellow Mini-Cons, and considers himself to be a new and superior breed of robot. Clench even tries to boss around larger Decepticons, confident that their fear of him and Galvatron will keep him safe. Subject is one of the physically most powerful Mini-Cons. In his vehicle mode, he has two independently targeting machine gun cannons that can track multiple targets simultaneously. He can also transform into a powerful handgun form useable by Galvatron. Athough powerful among Mini-Cons, subject often forgets that he is still weak compared to the . average Aucobot and Decepticon. This makes his tendency to pick fights a liability, especially when Galvatron decides he's outlived his usefulness.
Although Clench did not appear in the Dreamwave Armada series, he did get a one-page bio in their More Than Meets The Eye series.
Armada Galvatron with Clench (2003)
Clench was presumably a heroic Decepticon who was killed by the Autobots. He is a dimensional counterpart to the Generation 2 version of the character.
- Clench (1993) - Decepticon Leader - www.tfu.info
- Furman, Simon (2004). Transformers: The Ultimate Guide. DK Publishing Inc.. p. 77. ISBN 1405304618.
- Kevin Guhl (December 16th, 2009). "The 30 Most Unfortunately Named Transformers". http://www.toplessrobot.com/2009/12/the_30_most_unfortunately_named_transformers.php.
- Greg Sepelak & Trent Troop (w), Robby Musso (p), Robby Musso & Frank Milkovich (i). "Generation 2: Redux" Transformers Timelines v2, 5 (Summer, 2010), Fort Worth, Texas: Fun Publications
- BotCon - Clench Preview
- Transformers Armada: the Unicron battles by Andrew Donkin