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-Bok 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.

• Au-Yeung Tsan-Wah
• Charmaine Sheh Sze-Man
• Frankie Lam
• Kevin Cheng Ka-Wing
• Yoyo Mung Ka-Wai
• Linda Chung Ka-Yan
• Raymond Cho Wing-Lim
• Florence Kwok Siu-Wan