Feet dangling, no floor beneath you, and a 150-foot drop waiting at the top — Medusa has been rattling nerves at Six Flags Discovery Kingdom since March 18, 2000, when it opened as the first floorless roller coaster anywhere on the West Coast.
Built by Swiss manufacturer Bolliger & Mabillard for roughly $15 million, Medusa built its reputation on a rare “sea serpent roll” element and one of the largest vertical loops in the world. A quarter-century later — after a full repaint that wrapped up in 2025 — it remains one of the tallest, fastest, and most talked-about rides in Vallejo, California.
Quick Answer
Medusa is a Bolliger & Mabillard floorless coaster at Six Flags Discovery Kingdom in Vallejo, California, that opened on March 18, 2000. It stands 150 feet tall, reaches 65 mph, and threads seven inversions — including a 128-foot vertical loop and the first-ever “sea serpent roll” built on a B&M coaster — into a 3,937-foot layout, still the longest coaster track in Northern California. Riders must be at least 54 inches tall, and instead of a floor or lap bar, B&M’s over-the-shoulder harnesses hold everyone in place while their legs hang free.
Medusa at a Glance
Medusa opened March 18, 2000 at Six Flags Discovery Kingdom in Vallejo, California, built by Bolliger & Mabillard at a cost of roughly $15 million. It stands 150 feet tall with a matching 150-foot first drop, hits a top speed of 65 mph, and covers 3,937 feet of track — still the longest coaster layout in Northern California. The ride packs seven inversions into a run lasting about 3 minutes and 15 seconds, pulling up to 4.5 Gs along the way. Three trains, each seating 32 riders across eight rows, keep the line moving at Oasis Plaza near the park’s main entrance.
The Ride Experience
After boarding, riders lock into over-the-shoulder harnesses and watch as the floor panel beneath their feet splits open and retracts into the station — the signature floorless moment that leaves legs dangling for the rest of the ride. The train climbs Medusa’s 150-foot lift hill, tips over a pre-drop, and plunges into a 128-foot vertical loop, one of the largest of its kind anywhere in the world.
From there the layout keeps escalating: a dive loop, a zero-g roll, and then the ride’s namesake sea serpent roll, a double-inversion element that was the first of its kind ever built on a B&M coaster. A mid-course brake run offers a brief breather before Medusa closes with back-to-back corkscrews, a banked helix, and a snapping S-turn on the way back to the station, with an on-ride photo capturing riders’ reactions mid-loop.
Height Requirement, Restraints & Who Can Ride
Medusa’s minimum height requirement is 54 inches (137 cm). Unlike sit-down coasters, there’s no lap bar backing up the restraint — B&M floorless trains rely entirely on a padded over-the-shoulder harness that locks across the chest and lap, with a ratcheting system and backup pawls that release only in small increments if the primary lock is disengaged. Because there’s no floor and no footrest, riders should expect a more exposed, airtime-heavy feel than a standard B&M sit-down coaster, even though the trains, track, and inversions are built to the same B&M engineering standard.
A West Coast Milestone
When Medusa opened in 2000, it broke new ground as the first floorless coaster to operate anywhere on the West Coast, arriving in the middle of a wave of B&M floorless installations that redefined steel-coaster thrills in the late 1990s and early 2000s. Medusa’s sea serpent roll — essentially a stretched cobra roll broken into two distinct humps — appeared here before any other B&M ride adopted the element, giving Discovery Kingdom bragging rights that still hold today.
The 128-foot vertical loop remains one of the largest ever built, and at 3,937 feet, Medusa’s track is still the longest of any coaster in Northern California, a distinction unchanged since it opened.
Recent History: 25th Anniversary and a Fresh Repaint
Medusa marked its 25th anniversary on March 18, 2025, and Six Flags Discovery Kingdom celebrated with a special event on March 15, 2025 that gave the first 100 riders of the day a commemorative poster. The anniversary came on the heels of an extended refurbishment: Medusa closed in late 2024 so crews could strip and repaint the structure, which had faded after two-plus decades of sun exposure in Vallejo. The coaster reopened to guests in late May 2025 with its lime-green track and purple supports restored to their original vibrancy, and it has run on a normal seasonal schedule since.
Where to Find Medusa & Tips for Riding
Medusa sits in the Oasis Plaza area of Six Flags Discovery Kingdom, and its lime-green track is visible from much of the park, including near the main entrance. The front row delivers the clearest view into the 128-foot vertical loop and the least visual warning before each drop, while the back seats add a slightly sharper whip through the corkscrews and helix — both are worth riding if the line allows a reride. With three 32-rider trains running, the line typically moves fast outside of peak summer weekends; arriving near park opening or riding in the last hour before close usually means the shortest wait.
For current park hours, ticket prices, and parking rates — all of which change seasonally — check the official Six Flags Discovery Kingdom site before you visit.
Medusa roller coaster FAQs
How tall is Medusa at Six Flags Discovery Kingdom?
Medusa stands 150 feet tall, matching its first drop height.
How fast does Medusa go?
Medusa reaches a top speed of 65 mph.
How many inversions does Medusa have?
Medusa features 7 inversions: a 128-foot vertical loop, a dive loop, a zero-g roll, the two-inversion sea serpent roll, and twin corkscrews.
What is the height requirement to ride Medusa?
Riders must be at least 54 inches (137 cm) tall.
What kind of restraints does Medusa use?
Padded over-the-shoulder harnesses. There’s no floor or lap bar — riders’ legs hang free for the entire ride.
When did Medusa open?
Medusa opened March 18, 2000, as the first floorless coaster on the West Coast.
Where is Medusa located in the park?
In the Oasis Plaza section of Six Flags Discovery Kingdom, near the main entrance.
Was Medusa repainted recently?
Yes — it closed in late 2024 for a full repaint and reopened in late May 2025 in time for its 25th anniversary.
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