Canon History

Here's. A. Link. To. TRAAAAAAAAAAAAAAANSWIKI.

Cracktrans History

    Name: Kickback [ journal ]

    Affiliation: Decepticon, Insecticon

    Function: Espionage

    Alt-mode: Grasshopper (giant, mechanical, not very disguise-ish)

 ...Really, all he's done so far is bang Slag.

So Kickback arrived and proceeded to be chummy in the common room, got drunk and interfaced with Slag one night, generally made a low-level pest of himself -- and then Shrapnel and Bombshell showed up, making his life complete again.