Junior Hits England

Junior Hits England (also referred to as Challengers Bonus 1 and Challengers +1) is the first Challengers bonus episode in the Story Mode of the Nintendo 3DS version of Mario & Sonic at the London 2012 Olympic Games. The episode is unlocked after completing The Grand Showdown, and unlocks Junior, Super Hero? once it is completed.

Plot
Bowser Jr. arrives at Stonehenge, and is confused as he believes that it is London but it does not match with what he had heard about it. He notices a pair of green and blue Shy Guys passing by, and asks them where the Main Stadium is. The Shy Guys explain that the games are being held in London and that it is a long way from Stonehenge, but suggest that Bowser Jr. could do some training while he is there, as Yoshi comes out to Stonehenge to train. After the Shy Guys suggest that Bowser Jr. would not be as good as Yoshi, the pair challenge each other an Olympic Event.

Bowser Jr. beats Yoshi, who decides to train some more in preparation for a rematch during the Olympic games. Bowser Jr. asks the Shy Guys to tell Bowser how well he did when they next see him, which they agree to do. A pair of red and yellow Shy Guys arrive, having just come from London, and explain that some of Dr. Eggman's robots were causing problems on Tower Bridge, though Shadow and Silver managed to stop them. Bowser Jr. overhears their conversation and decides to head to London on his Bullet Bill to prove that he is better than Shadow, Silver and the robots. The Shy Guys notice that Bowser Jr. has left, but believe that he can take care of himself and continue their conversation.