Robot Buster!

"Robot Buster" is a Marvel UK Transformers story that was printed in issues 59 - 60 of the UK Transformers comic.

Synopsis
Wheeljack and Ratchet ask Optimus Prime to visit their lab to see their newest creation-- a large mechanical suit for Buster Witwicky that will allow him to fight alongside the Autobots. Optimus Prime is outraged at the notion of endangering Buster's life in battle and orders the suit dismantled. Buster commandeers the suit that night, convinced that Optimus will change his mind is Buster can defeat a Decepticon on his own. Approching the Decepticons' mountain base, he finds Frenzy alone and manages to defeat him, although the fight alerts current Decepticon commander Shockwave to Buster's presence.

After spending most of the night running from Shockwave and making futile attempts to combat him, Buster escapes momentarily by throwing sand in Shockwave's optic sensor. Shockwave recalls his recent burial at the hands of the Dinobots, augmenting his fury toward Buster. Buster reconfigures his suit to channel all of its energy into one blast against Shockwave, but the effort proves futile as Shockwave recovers and prepares to kill Buster. The Autobots arrive in time to save Buster and he agrees to resign from fighting the Decepticons. Shockwave, retreating in humiliation, concludes that the Autobots' concern for humans is a weakness he can exploit at a later date.