(Picture coming soon, once the mun's internet stops being royally craptastic. That may or may not happen soon, depending when she hurls her internet company into an active volcano.)

Canon History:

Depends on which continuity you're talking about. :D

Sometimes he chills on Cybertron until other fools show up and make things interesting, sometimes he follows everybody to Earth and kicks Megatron's ass.  A lot of the time he fights with the Dinobots to varying degrees of success.

One time he took over Cybertron and then went to Earth with his more-or-less-brainwashed minions and thrashed everybody there. It was pretty awesome, until he died.

Regardless, he always cares more about following what logic says he should do, even if it is working with the guy he kicked the shit out of earlier.

If you're really that interested, check this out: http://transformers.wikia.com/wiki/Shockwave

Cracktrans History:

If there's one thing he does before he dies, Shockwave wants to find out what it is about Earth that drives mechs totally crazy.

Originally contacted to help get Megs and co. out of that nasty ocean trench, Shockwave has worked on various projects since coming to Earth via Spacebridge (or a giant Plothole...we'll never know) and thinks he's one of the only sane ones left. He also really wants a vacation, no matter how much everyone else thinks he never has fun.  Don't annoy him, or he'll send you a brand new branch of (needlessly complicated) mathematics for a present. Just ask Starscream.

So far Shockers has refused to modify his alt-mode because Earth vehicles seriously suck compared to giant flying guns. He thinks humans are disgusting and completely lacking in the logic department, but their music isn't so bad.

He still only has one optic and one hand too, but it's not bad once you're used to it. Not having a face makes drinking games kinda weird sometimes though...