After a meteor-like object lands in the woods, poachers unearth a cave filled with alien eggs. As they attempt to destroy the eggs, one of them is killed by an unseen creature, leaving one egg intact. A young boy named Tommy finds the remaining egg and brings it home to hatch. As more murders occur around town, Tommy learns that his new pet alien, who he names Trumpy, possesses telekinetic powers.
Unfortunately the movie Extraterrestrial Visitors is not yet available on HBO Max.
| Directing | Juan Piquer Simón | Director |
| Writing | Juan Piquer Simón | Writer |
| Writing | Joaquín Grau | Writer |
| Production | Edward L. Montoro | Executive Producer |
| Production | Dick Randall | Executive Producer |
| Editing | Antonio Gimeno | Editor |
| Visual Effects | Juan Piquer Simón | Visual Effects |
| Crew | Basilio Cortijo | Special Effects |
