Time Traveler is the most common of all Micronauts. A Time Traveler was included with each Crater Cruncher, Warp Racer, and Ultronic Scooter. Just about every Micronaut vehicle was designed to fit a Time Traveler. As an example, the Hornetroid alien vehicle doesn't really fit Antron, Membros, or Lobros, but a Time Traveler fits right in there.
Time Traveler comes in several different colors. In addition, there are two variations in coloring: translucent, and opaque. The transparent scheme is the most common and is included with the Micronaut vehicles. The opaque Time Travelers are much rarer.