In the Daicon III Opening Animation, an unnamed girl observes the Science Patrol's aircraft as it lands. A masked figure emerges from the craft and hands her a cup of water, telling her to water a radish. She eagerly takes on this task but is quickly attacked by a series of enemies, including monsters, mechas, and starfighters. The animation follows whether the young protagonist can protect the water and reach the radish.
In the Daicon IV Opening Animation, an older version of the same girl appears, now wearing a Playboy Bunny outfit. She battles a wide range of legendary foes from across the universe. The action is nonstop, featuring lightsaber duels and riding the mystical sword Stormbringer. Set to Electric Light Orchestra's "Twilight," this sequence serves as a grand tribute to science fiction, bringing together numerous recognizable characters in one dazzling spectacle.