Cartoon Network has announced the latest LEGO TV series: LEGO is Back with an All-New Series! LEGO NEXO Knights Premieres Monday, January 11 at 5:30 P.M. (ET/PT) on Cartoon Network Cartoon Network presents a brand-new series from the prolific LEGO Group, LEGO NEXO Knights; kicking off Monday, January 11 at 5:30 P.M. (ET/PT) with new