Space Hippo's Secret Mission

In the back of the Speeder is Will's slightly tatty soft toy in an astronaut costume – his beloved Space Hippo.  When the race is over, Will is devastated to discover that Space Hippo is missing!

The friends in Everything's Rosie rally round and make Will a replacement toy, but it’s not the same.  

Have Will and Space Hippo really been on their last mission together?