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I'm currently investigating the local Nightstalker population since they seem to have developed a natural stealth field.Doctor Henry

Guess Who I Saw Today is a side quest in Fallout: New Vegas.

Quick walkthrough

Side Quest: Guess Who I Saw Today
Go to Jacobstown.
Speak with Doctor Henry.
Head to Charleston Cave.
Retrieve the chewed Stealth Boy.
Return to Doctor Henry.
Talk to Lily Bowen.
Deal with Keene.
Reward:500 XP

Detailed walkthrough

To begin the quest, the Courier must go to the Jacobstown lodge and talk to Doctor Henry and tell him they will help him research why the local night stalkers have begun turning invisible.

Meet with Lily Bowen, a nightkin standing by the pen outside the front of the lodge, after accepting the quest. One can invite her to come along, but it's not required (this will only work if the player does not have a fellow humanoid companion already).

Exit Jacobstown and circle around to the northwest to locate Charleston Cave, and enter. Continue through the cave. Eventually, one will come across a couple of bighorner bodies and a nightkin body, with Oh, Baby! next to it. Examine the nightkin and take his chewed Stealth Boy, the player will then be prompted to return to Doctor Henry back in the Jacobstown lodge. The night stalkers will not attack if the player has the Animal Friend perk.

Talk to the doctor back at Jacobstown. He'll inform the Courier that since the chewed Stealth Boy was a dead-end, using the Mark II Stealth Boy is the only remaining line of research available to him, and Lily is his best experimental subject. Talk to both the doctor and Lily; they both will agree to the experiment. It's a success, but as soon as the doctor is finished, Keene enters the room and demands the Stealth Boy Mk. II specs.

Note: If one talks to Lily while they are away from Jacobstown, she will run back to Jacobstown. If one needs her, they should be mindful of where this conversation takes place.

Make sure Doctor Henry actually does the experiment; it should not take more than 30 seconds for him to start.

  • Passing a Speech check (80) will cause Keene to back down.
  • Giving him the specs will cause him to leave peacefully.
  • If the specs aren't handed over, he and the two other nightkin will attack.
    • One can easily draw the three of them outside and let the super mutants help with the fight.
    • One can also go in the corner (where the wheeled tables are) to prevent the nightkin from attacking (or delaying them).
    • It is possible to use a Stealth Boy and reverse pickpocket a C4 plastic explosive onto Keene and his 2 nightkin before speaking with him. This way, if one chooses to fight them, a detonator can be used to kill all 3 at once.
    • Lily will leave the lodge as Keene is coming into the room, and will not help with the fight.

Speak with Doctor Henry again.

  • Passing a Science check (90) will convince Henry to test the Stealth Boys on night stalker brains.
  • One can also inform the Doctor the risk is too great, and Lily should not wear it.
  • One can also tell him that Lily should continue to wear the Mark II prototype.

Whichever decision is chosen, it will end the quest. Passing the Science check gives 590 XP, 90 more experience than the other two options do.

Quest stages

10 Look for the source of the night stalker stealth mutation.
15 (Optional) Ask Lily to help you investigate the night stalker mutations.
16 Keep Lily alive.
20 Tell Doctor Henry you've discovered a potential cause for the night stalker mutations.
30 Talk to Lily about participating in Doctor Henry's experiment.
40 Tell Doctor Henry to proceed with the experiment once Lily is present.
50 Wait for Doctor Henry to complete the experiment.
60 Speak with Keene and try to defuse the situation.
65 Kill the hostile Nightkin.
70 Speak with Doctor Henry.
80Quest finishedDecide whether or not Lily should continue to wear the Mark II prototype and inform Doctor Henry.


Behind the scenes

"Guess Who I Saw Today" was a soft jazz song written by Murray Grand and performed by Elisse Boyd.


  • Playstation 3Playstation 3 Xbox 360Xbox 360 Immediately after using the speech option with Keene telling Doctor Henry to do as he says, there will be a black screen crash. [verified]
  • Xbox 360Xbox 360 Sometimes, if you beat Lily to the lodge trying to exit the building again will cause a black screen crash. There is no fix for this at this time aside from exiting the game, erasing all add-on content (including patches) and loading the game with out the add-ons. [verified]
  • Playstation 3Playstation 3 If you come back to the lodge while the quest "Eureka!" is active, Doctor Henry may not respond to you talking to him, resulting in it being impossible to finish the quest. [verified]
  • Xbox 360Xbox 360 If you go into V.A.T.S. on Lily while she is testing the Stealth Boy MK II and she is invisible she will turn visible. However, this will not affect the quest. [verified]
  • PCPC Playstation 3Playstation 3 Xbox 360Xbox 360 If you ask Lily to help Doctor Henry while she is waiting in the Presidential Suite of the Lucky 38 without asking her to come with you, she will immediately leave to go speak to Doctor Henry. When you return to Jacobstown Lily will not be present anywhere, but you can stil talk to Doctor Henry to initiate the quest. He will go through the dialogue one sentence at a time, and the only solution to get the quest finished is to leave the building and return to Doctor Henry after each line. Please note that this solution does not work on Xbox 360 and PC. This may be fixed on the PC by using console commands. [verified]
  • PCPC If you have already stealth killed the two other Nightkin that follow Keene (even if nobody saw you do it) Doctor Henry and Calamity will suddenly become hostile upon Keene entering the room without his buddies, instantly failing the quest (being out of sight and/or Hidden will not prevent the Doctor and Calamity from becoming hostile).[verified]
Main quests
Act 1Ain't That a Kick in the Head · Back in the Saddle · By a Campfire on the Trail · They Went That-a-Way · Ring-a-Ding-Ding!
Act 2Wild Card (Wild Card: Ace in the Hole, Change in Management, You and What Army?, Side Bets, Finishing Touches) · The House Always Wins (I, II, III, IV, V, VI, VII, VIII) · Render Unto Caesar · Et Tumor, Brute? · Things That Go Boom · Kings' Gambit · For the Republic, Part 2 · You'll Know It When It Happens/Arizona Killer
Act 3No Gods, No Masters · All or Nothing · Veni, Vidi, Vici · Eureka!
Side quests
New California RepublicAnywhere I Wander · Back in Your Own Backyard · Bitter Springs Infirmary Blues · Boulder City Showdown · Can You Find it in Your Heart? · Climb Ev'ry Mountain · Don't Tread on the Bear! · Emergency Radio · Eye for an Eye · Flags of Our Foul-Ups · Hard Luck Blues · I Don't Hurt Anymore · I Put a Spell on You · Keep Your Eyes on the Prize · Medical Mystery · No, Not Much · Pressing Matters · Restoring Hope · Return to Sender · That Lucky Old Sun · The White Wash · There Stands the Grass · Three-Card Bounty · We Will All Go Together · You Can Depend on Me
Caesar's LegionBeware the Wrath of Caesar! · Caesar's Favor · Caesar's Foe · Caesar's Hire · Cold, Cold Heart · I Hear You Knocking · The Finger of Suspicion · We Are Legion
The StripBeyond the Beef · Bye Bye Love · Classic Inspiration · How Little We Know · Pheeble Will · Talent Pool · The House Has Gone Bust! · The Moon Comes Over the Tower
Freeside & Outer VegasBirds of a Feather · Bleed Me Dry · Debt Collector · G.I. Blues · High Times · Someone to Watch Over Me · The Coyotes · Wang Dang Atomic Tango
BoomersAnt Misbehavin' · Sunshine Boogie · Volare! · Young Hearts
Great KhansAba Daba Honeymoon · Cry Me a River · Don't Make a Beggar of Me · Oh My Papa
Powder GangBooted · I Fought the Law · Run Goodsprings Run · Why Can't We Be Friends?
Brotherhood of SteelEyesight to the Blind · Still in the Dark · Tend to Your Business
OtherCome Fly With Me · Crazy, Crazy, Crazy · Ghost Town Gunfight · Guess Who I Saw Today · Left My Heart · My Kind of Town · The Legend of the Star and A Valuable Lesson · Unfriendly Persuasion · Wheel of Fortune
Companion questsED-E My Love · For Auld Lang Syne · Heartache by the Number · I Could Make You Care · I Forgot to Remember to Forget · Nothin' But a Hound Dog · One for My Baby
Unmarked questsA Bit of Slap and Tickle · A Final Plan for Esteban · Access Powers · All Fired Up! · An Ear to the Ground · Andy and Charlie · Arachnophobia · Arizona Scavenger · Barton the Fink · Bear Necessities · Big Winner (Atomic Wrangler, The Gomorrah, The Tops, Ultra-Luxe, Vikki & Vance) · Bounty Killer (I, II) · Brotherhood Bond (I, II) · Caching in at the Cove · Cajoling a Cudgel · Claws Mended · Claws Out · Dealing with Contreras · Defacing the Humble Stone · Democracy Inaction · Don't Poke at the Bear! · Eddie's Emissary · Exhumin' Nature · Fight Night · Flogging a Dead Corpse · Friend of the Followers · Gland for Some Home Cooking · Harder, Better, Faster, Stronger · Hat's Entertainment · Help for Halford · Hidden Valley computer virus · Highway to the Danger Zone (I, II) · Honorary Rocketeer · I Love Bananas · Iron and Stealing · Keith's Caravan Charade · Laurifer Gladiator · Lenk's Bad Debts · Lily and Leo · Long-Term Care · Malleable Mini Boomer Minds · Maud's Muggers · Meeting an Equal · Missing a Few Missiles · Most Wanted · Not Worth a Hill of Corn and Beans · Old School Ghoul · A Pair of Dead Desperados (I, II) · Papers, Please · Pistol Packing · Playing on the Old Joana · Poor Meat Never Makes Good Soup · Powder to the People · Power to the People · Razzle Dazzle! · Reach for the Sky, Mister! · Rest and Resupply · Ringo's Caravan Rules · Rotface's Loose Lips · Saving (or Savaging) Sergeant Teddy · The Screams of Brahmin · Silus Treatment · Short-Term Treatment · Smooth-Talking Criminal · The Star Showdown · Strategic Nuclear Moose · Straus Calls · Strip Search · Suits You, Sarah · Tags of Our Fallen · A Team of Moronic Mercenaries · Thought for the Day · Tourist Traipse · Trudy's Radio Repair · A Trusted Aide · Useless Baubles or Fancy Trinkets? · We Must Stop Beating Like This · We Must Stop Meeting Like This · Wind-Brahmin Wrangler · You Gotta Break Out a Few Eggs · You Make Me Feel Like a Woman
Add-on quests
Dead MoneySierra Madre Grand Opening! · Find Collars (8: "Dog", 12: Christine, 14: Dean Domino) · Fires in the Sky · Strike Up the Band · Mixed Signals · Trigger the Gala Event · Put the Beast Down · Last Luxuries · Curtain Call at the Tampico · Heist of the Centuries · Big Winner, Sierra Madre
Honest HeartsA Family Affair · Arrival at Zion · Bighorners of the Eastern Virgin · Chaos in Zion · Civilized Man's Burden · Crush the White Legs · Deliverer of Sorrows  · Departing Paradise · Flight from Zion · Gathering Storms · Gone Fishin' · Happy Trails Expedition · Prisoners of War · Retake the Bridge · River Monsters · Rite of Passage · Roadside Attraction · Sanctity of the Dead · The Advance Scouts  · The Treacherous Road · The Grand Staircase · Tourist Trap
Old World BluesAll My Friends Have Off Switches · A Brain's Best Friend · Coming Out of Her Shell · Field Research · He Came... And Went · Influencing People · Midnight Science Fiction Feature! · Old World Blues · On the Same Wavelength · Picking Your Brains · Project X-13 · Sonic Emitter Upgrade · Welcome to the Big Empty · What's in a Name? · When Visitors Attack! · X-2: Strange Transmissions! · X-8 Data Retrieval Test · X-8: High School Horror! · X-13: Attack of the Infiltrator!
Lonesome RoadThe Reunion · The Silo · The Job · The Launch · The Tunnelers · The Divide · The Courier · The End · The Apocalypse