The Smiler, Steel roller coaster at Alton Towers Resort, United Kingdom.

The Smiler is a steel roller coaster in the X-Sector area of Alton Towers, Staffordshire, built by Gerstlauer with 14 inversions, including dive loops, a batwing, a sea serpent roll and a cobra roll. Its black track with yellow accents runs through The Marmaliser, a 15-metre spider-like steel structure with five legs and a wraparound LED screen.

The coaster opened in 2013, manufactured by German company Gerstlauer, and has held the world record for the most inversions since its debut. An accident in 2015 led to a temporary closure and subsequent technical modifications.

The Marmaliser was designed as part of the theming and displays a spider-like metal construction with moving parts and sound effects. The design combines mechanical elements with a fictional story that visitors experience through visual and acoustic stimuli.

The Smiler stands in the X-Sector area of Alton Towers, next to Oblivion, on the site of the former Black Hole. The station sits inside a building, and the first drop and heartline roll take place before the train leaves it. Five trains can run at once, giving a theoretical capacity of 960 riders per hour.

The Marmaliser, the ride's centrepiece, is a 15-metre-high metal spider structure with five legs, each fitted with a different effect over the track: bright lights, water spray, water vapour, rolling brushes and rotating optical patterns. A wraparound LED screen in its body shows themed graphics.