Bobbi Morse/Mockingbird (Adrianne Palicki) and Lance Hunter (Nick Blood) both left Agents of Shield for a spinoff show called "Marvel’s Most Wanted". After they officially got rid of the characters and shot the pilot the head of ABC said "This show will never see the light of day" and killed it. They both came back to Agents of Shield for a few episodes. It really was unfortunate because both characters were great.