The TS-001, short form for Tandem Slug, is a pair of Slugs connected one behind the other. The front vehicle is called the Slug Puncher while the back vehicle currently has no name. The TS-001 is developed as the tactical tank for the new generation. MS-Heart operates the TS-001; the individual Slug Puncher is operated by an AI.
Slug Puncher: The Slug Puncher focuses in close-range combat. It attacks by pounding the ground with its large fist. When the enemy is far away, it can close the distance by delivering a punch at fast speeds. The individual Slug Puncher also generates short shock waves from its fists.
"Rifle Slug": The Slug focuses on long-range combat. Its standard attack is shooting energy beams from its rifle. The Slug's frontal cannon fires piercing shots.
- The "Rifle Slug" is a reference to a scrapped concept of a Metal Slug spin-off based on humanoid SV-001's. One of these Slugs even has a red coloration and holds a similar rifle.
- The name "Tandem Slug" is taken from the game's sprite files. It is only referred to as the TS-001 in game.