A wearable alien abduction costume mounts a lightweight cardboard saucer on a backpack so a toy alien appears to beam up a child walking beneath it.
The premise is simple: the wearer becomes both the ship and its victim. A saucer rides above the shoulders on a backpack frame, a toy alien sits in a clear bowl dome on top, and strips of tinsel or fringe hang down to sell the beam that supposedly lifts the kid off the ground. Most home builds lean on the same handful of materials — cardboard, a plastic bowl, a few dowels or PVC pipes, and battery-powered LED lights. The result reads instantly in photos and holds up on a porch or at a party. Here’s the build order that actually works, plus the sizing and safety details that decide whether a child can wear it for more than ten minutes.
What You Need Before You Start
Gather everything first, because the assembly moves fast once the saucer halves are formed. A standard build needs cardboard for the ship body, a clear plastic bowl for the cockpit dome, a backpack, dowels or 1-inch-diameter PVC pipe for the support posts, spray foam or spray insulation for stiffening, LED string lights or a battery-powered light, tinsel or iridescent party streamers for the beam, and tape plus foil or metallic paint for the finish.
- Cardboard — two large circles, cut from shipping boxes.
- Clear plastic bowl — the dome over the alien figure.
- Backpack — the wearable base that carries the ship.
- 1-inch PVC pipe or dowels — the support posts that hold the saucer up.
- Spray foam — stiffens the inside so the structure holds shape.
- Battery LED lights — safer than plug-in lights for a moving wearer.
- Tinsel or fringe — the abduction beam under the ship.
- Tape, foil, metallic paint — assembly and reflective finish.
- Toy or inflatable alien — the figure in the dome.
How to Build the UFO and Mount It on a Backpack
Cut two cardboard circles, remove wedge-shaped slices from each, then tape the pieces back together so they bow into shallow cone halves. Cut a center hole in one circle for the alien to appear through, join the two halves into a saucer, and set the clear bowl dome on top. Push the PVC pipes or dowels into the base and lock them in place with spray foam inside the ship, then mount the pipes into the backpack so the saucer rides above the wearer’s shoulders. Add lights, reflective tape, foil, or silver paint, and finish with fringe hanging beneath the ship.
Spray foam expands as it cures, so apply it in small passes and let it set before adding more — overfilling can bulge the cardboard out of shape. Work outdoors or in a garage with the door open, and keep children away from the foam and hot glue until everything is fully cured and cool. Trim any hardened drips with a utility knife, then cover every exposed edge with tape so nothing snags on clothing or skin.
Three Versions, From Simplest to Full Build
The full saucer build is the showstopper, but it is not the only route, and the simpler versions are the ones that actually survive a busy Halloween night with a young kid inside them.
| Version | What It Uses | Best For |
|---|---|---|
| Full saucer rig | Cardboard saucer, plastic bowl dome, PVC posts, spray foam, LEDs, tinsel beam | Photos, contests, porch displays |
| Inflatable alien carry | Inflatable alien strapped to a backpack, torn old clothes on the child | Young kids, quick assembly |
| Stuffed torso illusion | Stuffed alien torso or mask on a backpack, plus stuffed pants and legs | Tweens and teens, walking comfort |
The inflatable version is the fastest: strap an inflatable alien to a backpack, dress the child in torn or altered old clothes, and tighten the straps so it looks like the alien is hauling them off. The stuffed torso version flips the illusion — the wearer becomes the abducted body, with stuffed pants and legs hanging behind to suggest a limp figure being lifted. If you would rather skip the construction entirely and compare finished options, our tested alien kidnapping costume roundup breaks down ready-made picks by size and price. Country Living’s tutorial and Morphsuits’ alien abduction guide both walk through the saucer style step by step, and they are worth a look before you cut cardboard.
How to Keep the Costume Wearable and Safe
Weight and balance decide whether this costume lasts the night. Keep the saucer and dome light, mount the load high and centered on the backpack, and shorten the support pipes until the ship clears the wearer’s head by a few inches. Rigid foam, cut PVC, and bowl edges can all leave sharp points, so tape or cover every exposed edge before anyone puts it on.
Stick with battery-powered lights; a cord trailing to an outlet defeats the point of a wearable ship and creates a trip hazard. If a child is playing the abducted role, test the fit with the full load in place before the event — check that vision is clear, that the straps do not dig into the shoulders, and that they can walk, turn, and sit down without the saucer tipping. A hooded cape or similar single piece can substitute for part of a simpler build without adding much weight. The costume suits Halloween parties and photo sessions far better than active walking or long wear, since the top-heavy saucer limits movement, and adult supervision should stay close whenever spray foam, hot glue, or craft knives are in play.
FAQs
How long does this build take?
Most of the work happens in one afternoon. Cutting and taping the saucer halves takes about an hour, and the spray foam needs time to cure before you add lights and fringe. Budget three to four hours total, plus drying time for paint or glue.
Can a young child actually wear the saucer version?
Test a short walk indoors first, and watch for the saucer tipping when they turn their head. The inflatable version is easier for small kids.
Do I need PVC pipe, or will dowels work?
Wooden dowels work fine for a lightweight saucer and are easier to cut. PVC pipe holds up better if the ship is larger or you plan to reuse the costume, since it resists bending when the wearer moves around.
How do I attach the beam tinsel?
Tape strips of tinsel or iridescent streamers to the underside rim of the saucer, spacing them evenly so they hang just past the wearer’s shoulders. Add a few to the back of the backpack so the effect holds when the child turns.
References & Sources
- Country Living. “This DIY UFO Costume Is Out of This World.” Source of the saucer build pattern and materials list.
- Morphsuits. “Alien Abduction Costume.” Source of the backpack-mounted abduction concept and variation ideas.
- Instructables. “Abducted by UFO Costume.” Source of the cardboard, PVC, and spray foam assembly steps.