The Reclining alien is an alien in the Spaceman Spiff universe. It appeared in a single Sunday strip from 7/3/88, where Spiff explores an uncharted planet. The alien was so large and integrated so seamlessly with the planet's surface that Spiff only realized he was walking on it when it opened its cavernous mouth. Despite its rock-like appearance, its skin is soft and porous.
Spiff considered the alien hostile, and set his Death Ray Blaster upon it when it awakened. The alien's real-life counterpart was Calvin's father, whom Calvin was actually setting his dart gun upon.