Interstellar Radio

The Interstellar Radio is one of the ship parts featured in  and. The Interstellar Radio emits a constant S.O.S. signal, and emits voices to counteract the loneliness of space. Once found and brought back to the S.S. Dolphin, it will float around the spaceship, to starboard of the nose (to the front and right of Captain Olimar when he is seated). During take-off, the Interstellar Radio moves around and latches on to the hull on the starboard side, next to the #1 Ionium Jet. Olimar hints in his second monologue for this part that all parts may not be needed to fly the ship. Because Olimar says this, many players mistake this piece for an optional ship part, but it is mandatory.

Collecting the part
It is found inside the body of a Puffy Blowhog in the big lake, and may be near three Water Dumples. On land, defeat the Spotty Bulbear to ensure the Pikmin's safety.

In Pikmin 4
The Interstellar Radio is the final objective of the game's prologue. Captain Olimar and Moss land in the Hero's Hideaway to search for it, and after gathering back his Pikmin that scattered out of the Onion, he investigates the top of a coffee table. There he faces off against a Porquillion which releases the Interstellar Radio upon death, revealing it ate the part. As soon as he retrieves the ship part, he sends out an S.O.S. signal, which is received by the Rescue Corps and many civilians. This sequence is repeated in Olimar's Shipwreck Tale.