Season 10 of 9-1-1 is rumored to include several new regular and recurring characters. These additions could shake up storylines and test loyalties at the station. Here’s the lowdown.

1. The Rookie Firefighter With a Hidden Agenda

• Fans speculate that this rookie is connected to a major disaster from the past.

• Athena immediately distrusts him, suspecting secrets he may reveal.

• His arrival challenges established friendships and sparks tension between long-time crew members.

2. The Tech-Savvy EMT Who Redefines Rescue Protocols

• A young EMT joins with cutting-edge tech skills.

• Her devices improve response times but also create rivalry as older members feel threatened.

• Expect epic action sequences and inventive life-saving techniques.

Fans theorize that this character will also be central in uncovering cyber-related emergencies.

3. Guest Stars That Could Become Regulars

• Several well-known actors are rumored to appear as multi-episode arcs.

• Their presence could dramatically impact personal storylines — romances, conflicts, and even leadership challenges.

• These new faces promise to expand the 9-1-1 universe, blending suspense with fresh interpersonal drama.