Ben 10 has a watch-like alien device called the Omnitrix (later the Ultimatrix) that allows him to turn into alien creatures. Some boys love him - others not so much :) My son never really got into the whole Ben 10 thing-oh - but all the same - I have made this free sleepover invitations for those who have boys who love Ben 10 and would like this invitation for their birthday party sleepover. Just fill in the blanks with the details of your own party so it's totally personalised :)