The band gets ready for their grand concert at the school feast. The principal soon regrets her haughty attitude over Wiels leaving the school for his own management job when she hears it's director of the whole district. Freek has learned that the badge is infra-red and isn't faulty but simply has a flat battery. When he Oscar replace it to intrude and try if it can sabotage the concert, Quinten gets an automatic notice in the lab and catches on.
22 December 2011 (Belgium)
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