Test Tube Aliens - Spron Hatch your alien and watch it fizz and grow! Aliens grow to full-size in about 14 days An LED light starts to blink as your alien is hatching Register your alien's Intergalactic Passport at testtubealiens.com and learn fun facts and secrets about your alien Collect them all! Look for Test Tube Aliens Operation Lab and Fizzitors to add to your collection (coming soon)