- “Reunited with her team, Cyber Kat and her teammates are ordered by Vendetta to secure the mall's underground tunnels to ensure complete safety.”
- ―Mission description[src]
Underground is the sixth mission in the Futuristic Zombies Campaign. The mission sees Cyber Kat finally be reunited with her teammates Envoy, Alice "Phantom" T, and are ordered by Tomiko "Vendetta" Hayashi to secure the Hypercenter Mall's lower underground levels. The mission's events take place immediately after "Vanguard", thus two hours before "Hypercenter".
Completing this mission on any difficulty unlocks Joker and Ketch as Private Army Operators for use in the Zombies mode, and completing it on Nightmare difficulty unlocks their personal weapons Terminal Velocity and Kohhn as Loadout weapons in Zombie Operations.
Characters
- Cyber Kat
- Techno
- Envoy
- Alice "Phantom" T
- Wedge
- Tomiko "Vendetta" Hayashi (Cutscene and voice only)
- Victor "Stratus" Payton (Cutscene and voice only)
- Jennifer "Vega" Reese (Cutscene and voice only)
- Roxanne Summers (Cutscene and voice only)
- Jessie "Dynamo" Kessler (Voice only)
- Amber Summers (Mentioned only)
- Danielle "Rhythm" Greer (Mentioned only)
- Samantha "Pulse" Reed (Mentioned only)
- Renee "Trinity" Lynch (Mentioned only)
- Biggs (Mentioned only)
- Mirage Corporation
- New Elpis Police Service
- Lieutenant Walker (Cutscene and voice only)
- Sergeant Richard Manson (Cutscene only)
- New Elpis Police Officers
- New Elpic Citizens
- Helsie (Cutscene only)
Plot
To be added.
Weapon Loadout
| Starting loadout |
|---|
 CyberCat  Sweet Shot |
| Found in level |
|---|
| Unusable |
|---|
Achievements and Trophies
- Underground - Complete "Underground" on any difficulty.
- Sewer Rats - Complete "Underground" on Nightmare difficulty.
- Thanks, Agent! - In the underground levels, do not allow a single Mirage Security Trooper or Police Officer to die on Nightmare difficulty.
- Weapon Specialist VI - Get a kill with every obtainable weapon on Nightmare difficulty.
- Ancient Relic VI - Find the pristine AK-12 in the Security Locker.
Trivia
- Obtaining the "Weapon Specialist VI" achievement/trophy may be difficult as the DC-15A, ICR-7 and Strife are only dropped by the Mirage Security Trooper and Police Officer NPCs.
- This makes obtaining all achievements/trophies on this mission requiring two playthroughs.
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