The ResponderSeries 1Episode 4BBC One Duration: 57 minutes Audio describedFirst broadcast: Tue 1st Feb 2022, 21:00 on BBC One HDLatest broadcast: Tue 1st Feb 2022, 21:00 on BBC One Northern Ireland HDAvailable for 2 monthsWatch nowChris reaches rock bottom. Rachel begins to suspect Mullen may not be all he appears, and Casey teams up with Marco to find a buyer.ContributorsChris Carson:Martin FreemanRachel Hargreaves:Adelayo AdedayoRaymond Mullen:Warren BrownKate Carson:MyAnna BuringCasey:Emily FairnMarco:Josh FinanCarl Sweeney:Ian HartWriter:Tony SchumacherDirector:Fien TrochProducer:Rebecca FergusonProduction Company:Dancing Ledge ProductionsGenresDramaCrimeBrandThe ResponderSeriesThe Responder: Series 1 Source: BBC Online