Tighten apparently crushed him with the radio tower, but he turned out to be Megamind's right-hand man, Minion, in disguise.
Roxanne then continued on dating Bernard (who was actually Megamind in disguise), much to Hal's disappointment and anger.
Tighten took Metro Man and Megamind's DNA to become Blue Tighten.
Megamind took care of Blue Tighten with his patented spray.
Tightenville was the metropolis of Metro City (or Metrocity) before and during Megamind's dictatorship until Hal Stewart usurped him under the name of Tighten in the 2010 Dream Works animated film Megamind.
After Tighten' overthrow, Tightenville were 'Metrocity' again and were threatened again when The Doom Syndicate tried to steal both Metro Man and Megamind's DNA to take over it, but they were defeated by Megamind.