Cracking the Code: What "Secret Weapon" Really Means for Every Major Alton Towers Coaster
Next time Alton Towers teases a brand-new coaster with drone footage, cryptic social posts, and a mystery countdown, there's a good chance it's already got a number attached to it — one you'll never see on any official signage. Since the early 1990s, every major rollercoaster development at the park has carried an internal codename: Secret Weapon, followed by a number. SW3 was Nemesis. SW7 was The Smiler. SW9, as it turns out, was Toxicator.
It's one of the longest-running, least publicised traditions in British theme parking, and once you know the sequence, it's genuinely hard to look at the park's ride lineup the same way again. Here's the full story, ride by ride, of what "Secret Weapon" actually means and where every number in the sequence has gone.
What "Secret Weapon" Actually Means
The Secret Weapon codename dates back to the very earliest planning stages of what would eventually become Nemesis, and it's stuck around as the park's standard internal placeholder name for every major coaster project since. The logic is straightforward: rather than let a new ride's real name and theme leak before the park is ready to reveal it, engineers, planners, and marketing teams simply refer to the project internally as "SW" followed by the next number in the sequence, keeping the eventual name and story under wraps until an official announcement.
Over the decades, "SW" has become synonymous with Alton Towers' biggest developments specifically — not every new attraction gets a Secret Weapon number, but the ones that do are, almost without exception, the park's headline, world-first, front-page-of-the-brochure rides. Understanding the sequence is genuinely one of the best ways to trace the park's own history of ambition, one major project at a time.
SW1 and SW2: The Rides That Never Were
Before Nemesis existed even as a concept, there was SW1 — a planned Arrow Dynamics Pipeline Coaster, provisionally themed around an ambiguous secret weapon testing facility, intended for what would eventually become the Nemesis site. Designer John Wardley worked on the layout throughout 1991, but the project ran into trouble almost immediately: Arrow Dynamics, the Utah-based manufacturer, was experiencing genuine financial problems at the time, and Wardley himself found real technical issues with the ride's design, particularly given the park's strict height restrictions limiting the coaster's potential track length to as little as 300 metres.
Rather than abandon the concept entirely, the project was revived a year later under the codename SW2 — a revised version of the same Arrow Pipeline Coaster concept, this time with rock blasting used to clear a larger space and accommodate a bigger layout. But SW2 met the same fate as its predecessor. When Wardley finally got the chance to ride an actual Arrow Pipeline Coaster prototype in person, he came away distinctly unimpressed, describing the experience as slow and energy-inefficient — hardly the world-first thrill ride Alton Towers needed to justify the investment.
It's genuinely worth pausing on how differently Forbidden Valley might look today had either of these early plans gone ahead. The pit excavated for SW1 and SW2 was a different shape entirely from the one Nemesis eventually occupied — larger, flatter-bottomed, and extending further into what are now neighbouring areas of the park. The abandoned digging for these two unbuilt rides directly shaped the physical space that Nemesis would eventually be built into, even though neither project ever got anywhere near opening day.
SW3: Nemesis, Where the Tradition Properly Began
With the Arrow Pipeline concept dead, Alton Towers went looking for an alternative, and found it through a genuinely fortunate industry connection. Word had reached the park about a new coaster type being developed by manufacturer Bolliger & Mabillard for an American client, Six Flags. Alton Towers reached out directly, and after some careful diplomatic footwork — B&M wouldn't share specifics without Six Flags' blessing — an agreement was struck: B&M would build a similar inverted coaster for Alton Towers, on the understanding that the favour would eventually be returned.
Wardley took on the resulting project under the codename SW3, and the original "secret military facility" concept from SW1 and SW2 evolved into something considerably more memorable: an organic alien creature, trapped beneath the ground for millennia before being disturbed by construction work. Working alongside then-Marketing Director Nick Varney, Wardley landed on the name Nemesis, and the ride opened to genuine media fanfare on 19th March 1994, following a soft opening a few days earlier.
The launch came with a genuinely full-scale marketing push befitting the park's first true world-class thrill coaster. The ride's own specially written creature myth was narrated by Tom Baker — best known to a generation as Doctor Who — and merchandise stretched from a dedicated Nemesis comic book to a specially commissioned range of branded drinks, sold through the ride's own dedicated shop. Nemesis has since carried more than 52 million riders, and remains, even after its full 2024 rebuild as Nemesis Reborn, the ride most closely associated with the entire Secret Weapon tradition.
SW4: Oblivion, the World's First Dive Coaster
Following Nemesis's runaway success, SW4 became Oblivion, opening on 14th March 1998 at a cost of around £12 million — equivalent to roughly £23 million today. Manufactured by B&M as the world's first Dive Coaster, Oblivion was marketed around a genuinely unsettling conceptual framework, with promotional material built around four distinct stages: physical trauma, psychological breakdown, the schizophrenic sequence, and finally chaos, reinforced by screens placed throughout the queue line. It remains one of the most instantly recognisable rides in UK theme parking, defined by its near-vertical drop into a tunnel below ground.
SW5: Air, Later Reborn as Galactica
SW5 has one of the more unusual development timelines of the whole sequence. Wardley originally conceived the ride's core concept — a flying coaster, letting riders lie face-down in a prone position — back in 1994, the same year Nemesis opened. But the technology simply wasn't ready. It would take eight further years before B&M could actually manufacture the ride, with Consign handling the computer systems and Tussauds Studios delivering the theming, before Air finally opened in 2002 as the world's first flying coaster built by B&M.
The ride was substantially refurbished for the 2016 season, reopening under a new name, Galactica, with the addition of a virtual reality headset element themed around space flight — a change that's drawn genuinely mixed opinions from regular visitors ever since, with some finding the VR immersive and others finding it detracted from the underlying ride quality.
SW6: Th13teen, the World's First Vertical Free-Fall Coaster
SW6 became Th13teen, replacing the park's earlier Corkscrew coaster and opening for the 2010 season as an Intamin family drop coaster. Its centrepiece — a horizontal section of track where the train genuinely stops before free-falling downward — made it the world's first vertical free-fall rollercoaster, a genuinely impressive piece of engineering wrapped inside what turned out to be, once the marketing hype settled, a fundamentally family-friendly ride experience.
SW7: The Smiler, the World's First 14-Inversion Coaster
SW7 arrived in 2013 as The Smiler, manufactured by Gerstlauer and built around a dystopian "Ministry of Joy" concept. It set a genuine world record on opening, holding the title for the most inversions on any rollercoaster anywhere in the world at 14 — a record that, remarkably, still stands more than a decade later.
SW8: Wicker Man, Bringing Wood Back to the Towers
SW8 became Wicker Man, opening at the start of the 2018 season as a GCI-manufactured wooden coaster in Mutiny Bay, replacing the site's earlier Flume ride. It marked the UK's first new wooden coaster built in over 20 years, and while John Wardley wasn't the ride's primary designer this time around, he did have a hand in the project, helping to re-profile the ride's first drop before it opened — a nice piece of continuity given his fingerprints are on every Secret Weapon before it.
SW9: Toxicator, Confirming the Sequence Continues
For years, enthusiast speculation swirled around what SW9 might eventually turn out to be — including, at one stage, chatter connecting the codename to Project Horizon, the long-delayed mystery indoor coaster still stuck in planning limbo. That speculation has since been resolved: SW9 was Toxicator, the record-breaking elevated top spin ride that opened in Forbidden Valley in March 2025, tying directly into the ongoing Nemesis storyline as part of the Phalanx's continuing struggle to contain the alien creature and its offspring.
So What Does That Mean for Project Horizon?
Given SW9 has now been accounted for, it's worth revisiting the earlier community speculation connecting Project Horizon to that specific codename — a connection that no longer holds up cleanly, since Toxicator has already claimed the SW9 title. If Project Horizon does eventually turn out to carry a Secret Weapon codename of its own, the next available number in the sequence would logically be SW10, though this remains entirely unconfirmed by Alton Towers itself. It's a useful reminder that enthusiast speculation, however well-reasoned, can be overtaken by events — in this case, quite literally by a different ride claiming the number first.
Why Not Every Coaster Gets a Secret Weapon Number
It's worth being clear that Secret Weapon status isn't automatically granted to every new rollercoaster the park builds. Rita and Spinball Whizzer, despite both being genuine, well-regarded coasters in their own right, were never part of the Secret Weapon programme. Neither were family-oriented rides like Runaway Mine Train or the Octonauts Rollercoaster Adventure, which didn't carry the scale of pre-launch marketing campaign that's historically defined a true Secret Weapon project.
The distinction seems to come down to ambition and marketing scale rather than technical merit alone — Secret Weapon status has consistently gone to the rides positioned as the park's genuine headline investment for that particular year, typically carrying some kind of world-first claim and a substantial dedicated marketing campaign, rather than every new addition to the ride lineup regardless of size or budget.
Why This Naming Tradition Still Matters
There's something genuinely valuable about a park maintaining a naming tradition across more than three decades and nine (soon, perhaps, ten) major projects. It gives the enthusiast community a shared language for tracking the park's ambitions over time, and it's become a minor tradition in its own right for dedicated fans to speculate about the next number in the sequence long before any official announcement — exactly the kind of grassroots engagement that money genuinely can't buy.
It also tells a quietly interesting story about the park's own history of risk and reward. Two of the nine numbers — SW1 and SW2 — represent genuine dead ends, projects abandoned before they ever got close to opening, a reminder that even a park with Alton Towers' pedigree hasn't always got it right on the first attempt. The fact that Nemesis, one of the most celebrated rollercoasters in UK history, only exists because two earlier attempts at the same site failed first is a genuinely good reminder that the park's biggest successes haven't come from an unbroken run of perfect decisions, but from a willingness to scrap what wasn't working and try again.
Quick Reference: The Complete Secret Weapon Sequence
- SW1 (1991): Arrow Pipeline Coaster concept for the Nemesis site — never built, abandoned due to technical and financial issues
- SW2 (1992): Revised Arrow Pipeline Coaster, larger pit blasted for the project — also abandoned after Wardley found the prototype slow and inefficient
- SW3 (1994): Nemesis — Europe's first inverted rollercoaster, built by B&M
- SW4 (1998): Oblivion — the world's first Dive Coaster
- SW5 (2002, conceived 1994): Air — the world's first B&M flying coaster; refurbished and renamed Galactica in 2016
- SW6 (2010): Th13teen — the world's first vertical free-fall rollercoaster
- SW7 (2013): The Smiler — the world's first 14-inversion rollercoaster
- SW8 (2018): Wicker Man — the UK's first new wooden coaster in over 20 years
- SW9 (2025): Toxicator — the world's only elevated top spin ride
- SW10?: Unconfirmed — possibly Project Horizon, though this has not been officially verified by Alton Towers
- Not part of the programme: Rita, Spinball Whizzer, Runaway Mine Train, and the Octonauts Rollercoaster Adventure