For most of the series, the Omnitrix remains on Ben, and hence the aliens are described in relation to him. The What If-styled episode "Gwen 10" shows what some of the aliens would appear as if they were female, and the episodes "Ben 10,000" and "Ken 10", set in the near future (relative to the show) highlight what the aliens would appear as if they were older. Though Ken, Ben's son, also has an Omnitrix in the later episode, his aliens are no different from those normally featured.