Twin Spin and Toptwist. I can't be bothered to look up the correct names.

One of the solicits at Big Bad Toy Store this month, and probably the same solicit at your local comic shop, is a case of new Fall Of Cybertron deluxes. One of the robots is the earlier feared FOC Whirl, and it looks like he's one of five robots, along with Roadbuster, IMPACTOR, Twin Twist and Topspin, that are retools of the Combaticons from this line. They are known to many fans (of nearly every comic series) as the Wreckers...

...who of course didn't combine (in any of the comics series). But, because they are retools (new heads, new weapons, new terrible paint jobs) they combine to form "Ruination."