'Captain America in the Doom Tube of Dr. Megalomann' is a text-based adventure game written by Stefan Ufnowski and published by Go! (US Gold) for the Commodore 64 in 1987. The game is based on the Marvel Comics character Captain America and follows his mission to thwart the plans of the villainous Dr. Megalomann, who has created a dangerous device called the Doom Tube. Players navigate through a series of interconnected locations, solving puzzles and interacting with objects to progress the story. The game employs a parser-based interface, requiring players to input commands such as 'take,' 'use,' or 'go' to interact with the environment and advance the narrative. The text descriptions are accompanied by static illustrations, adding visual context to the gameplay. The game's structure is linear, with a focus on logical problem-solving and exploration, typical of text adventures from the era. It is a straightforward adaptation of the superhero genre into the interactive fiction format, offering a blend of comic book storytelling and classic adventure game mechanics.