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Developer Update | Introducing Sigma | Overwatch

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Overwatch’s tank roster just got a hero who throws the rules of gravity out the window.

On July 23, 2019, Blizzard Entertainment game director Jeff Kaplan sat down for a Developer Update to formally unveil Sigma, Dr. Siebren de Kuiper, as the 31st playable hero in Overwatch and the newest tank on the roster. The reveal landed a day after an animated origin short introduced Sigma as a Dutch astrophysicist whose mind — and gravity itself — broke during an orbital black hole experiment, before Talon weaponized what was left of him. Kaplan used the video to walk through every piece of Sigma’s kit while the hero went live for testing on the PC Public Test Realm under update 1.39.

• Sigma launched simultaneously to the PC PTR under patch 1.39 as Overwatch’s newest barrier tank.
• His five-part kit includes Hyperspheres, Experimental Barrier, Kinetic Grasp, Accretion, and the ultimate Gravitic Flux, which deals half of an enemy’s maximum health as fall damage.
• Kaplan and Blizzard debuted live Sigma gameplay on former Overwatch League pro Brandon “Seagull” Larned’s Twitch stream alongside the Developer Update.

An Astrophysicist Broken By His Own Experiment

The backstory Kaplan references in the video traces back to the origin short released July 22: Siebren de Kuiper was a brilliant Dutch astrophysicist conducting research on an orbital station when a black hole experiment went catastrophically wrong. The incident left him with severe psychological trauma but also handed him an unnerving new ability — direct control over gravity itself. Talon, never shy about recruiting broken geniuses, found him and turned that trauma into a weapon.

Kaplan frames Sigma less as a battering-ram tank in the mold of Reinhardt and more as a floating, unpredictable anchor point who bends physics around him rather than simply soaking damage. That distinction matters for how he plays on live servers once the PTR testing period wraps.

Breaking Down The Kit

Sigma’s primary weapon, Hyperspheres, fires twin gravitic charges that ricochet off walls and floors before imploding and yanking nearby targets toward the blast. It’s a weapon built around angles and bounces rather than direct line-of-sight trades.

His secondary tool, Experimental Barrier, is where the tank identity really shows up. Instead of a stationary wall like Winston’s bubble, Sigma launches a floating shield forward that can be halted at any point along its path and pulled back at will — letting him wall off a choke point mid-fight or yank protection back to cover a retreating teammate. Kinetic Grasp then lets him snatch incoming enemy projectiles out of the air and convert them directly into personal shielding, turning an opponent’s damage output into his own survivability.

Gravitic Flux lifts every enemy in its radius into the sky, holds them there, and slams them back to the ground for half their maximum health in damage.

Accretion And The Ultimate

Accretion has Sigma gather loose environmental debris into a boulder that he hurls at enemies, dealing damage and knocking them down — a setup tool that pairs naturally with the rest of his gravity-based kit. Then there’s Gravitic Flux, the ultimate Kaplan spends real time on in the video: Sigma briefly gains flight, lifts every enemy caught in the target radius off the ground, suspends them in midair, and then slams them back down. The fall deals half of each target’s maximum health in damage, making it one of the more punishing area ultimates in the hero’s class.

Kaplan’s walkthrough makes clear that Sigma’s kit rewards players who think in terms of positioning and timing rather than raw point-and-click damage — closer in spirit to a support-tank hybrid than a traditional shield-bot.

Testing It Live

To back up the video, Blizzard had Kaplan appear on former Overwatch League pro Brandon “Seagull” Larned’s Twitch stream to run Sigma live in front of the community, giving viewers a real-time look at how Hyperspheres bounce off walls and how Experimental Barrier holds up when yanked back mid-engagement. It’s the kind of hands-on demonstration Blizzard has leaned on before with new hero reveals, and it comes in the same stretch of the year when other shooters were rolling out their own reveal content — Respawn’s Apex Legends Defiance gameplay trailer among them.

Sigma now sits on the PTR under patch 1.39 while Blizzard collects feedback before any move to live servers, with Kaplan’s video serving as the definitive breakdown of exactly what a Talon-weaponized astrophysicist brings to a Overwatch tank lineup that, until now, hadn’t seen a kit built quite so heavily around bending gravity itself.