Bomb disposal expert Ivan Yeung returns from England and happens to come across a grenade case by accident. Ivan's skills are highly appreciated by senior chemist Ko Yin-pok and he is invited to join the Forensic Division. Meanwhile, other members of the team are caught in an explosive incident that ends up changing team dynamics.

• Bobby Au-yeung Tsan-wah
• Yoyo Mung Ka-wai
• Frankie Lam
• Linda Chung Ka-Yan
• Florence Kwok Siu-wan
• Fred Cheng Chun-Hung
• Raymond Cho Wing-lim
• Kevin Cheng Ka-Wing