White tests out a Pokemon battleground prototype - The Battle Subway.
Meanwhile, Black is happily reunited with an old friend...under unhappy circumstances. Then Gym Leader Clay reveals a dangerous secret. Now Black must prove himself to the other Unova Gym Leaders so he can join their team to fight a common enemy - an evil organisation that might jeopardise the Pokemon League Championship itself!
Will Black earn the trust of the Unova Gym Leaders in time...by ringing a bell?!