The idea originated from a comic strip by artist Angel Tirado during his high school days and the project initially started on the ZX Spectrum but went through a turbulent development cycle before its eventual launch to the market.

Capitán Sevilla is a side-scrolling platform game where players assume the role of Mariano López, a transporter-turned superhero after eating a radiation-affected blood sausage to fight against the mad scientist Torrebruno and protect Earth.

[c][5][6][7] Mateos decided to form the group using royalties obtained from his previous works and placed advertisements across universities to recruit people with programming and graphic design experience for ZX Spectrum and Amstrad CPC.

[5][6][7] Mateos and the staff rented an apartment in Triana, Seville to convert the floor into an office, acquired computers and development tools, assigning roles according to the abilities of each member, naming their team as Hi-Score and starting work on Capitán Morcilla.

[5][6][7] The idea originated from a comic strip of the same name created by lead graphic designer Angel Tirado during his high school period, with its script being used as basis, and Mateos proposed the project to Dinamic.

[7] Tirado also implemented a technique based on a comic book guide by José Beá to transpose the hand-drawn artwork from paper into pixel art, in order to process and store graphic information on the computer.

[7] Development lasted more than a year and a half with a personnel between thirteen and fourteen members but proved to be chaotic, as the team missed the scheduled 1987 Christmas release campaign and left their apartment due to Mateos running out of money to pay the rent and pending bills.

[6] Dinamic co-founder Victor Ruiz claimed that his company did not intervene in the game's development aside from the cover art design and its title, which was renamed as Capitán Sevilla due to marketing reasons despite opposition from Hi-Score staff.

[9] French magazine Amstar reviewed the Amstrad CPC version, commenting about the action, color palette and sprite animations in a positive light but noted that players "need to be particularly well trained in the handling of the joystick" to successfully progress in Capitán Sevilla.

In 2009, a remake was published under a GPL license for Linux, Macintosh and Microsoft Windows, which was developed over the course of three and a half years by members of ComputerEmuZone Games Studio (CEZ GS) Luis Ventura and Daniel Celemín.