From their returns in Music Bank and M!Countdown, they made a comeback on Show!Music Core! Performing Dancing Queen and I Got A Boy as they wear their Gangster G / 80’s fashion! Check it out~

Dancing Queen

http://www.youtube.com/watch?feature=player_embedded&v=gdxX2DUd7d0

I Got A Boy

http://www.youtube.com/watch?feature=player_embedded&v=PZ4ux_CFWKg

Source: wondergeneration