GameTrailers sneaks in a fifth installment of its Metal Gear Retrospective, with the latest episode focusing on the portable versions of Snake's adventures. The episode covers the GameBoy's Ghost Babel, along with the PSP's AC!D and the only handheld title part of the MGS canon, Portable Ops.

As we all prepare for Metal Gear Solid 4's launch tomorrow, don't forget to check out the other four retrospective episodes. The upcoming final installment in GameTrailers' Metal Gear review will attempt to weave together the whole MGS saga. As incredible as that feat will be, it still doesn't beat the time GameTrailers attempted to explain the Legend of Zelda timelines.

This article was originally published on Joystiq.