sentences:  Many of Blake's schemes require co-operation and expertise from others.Characters are often betrayed by family and friends, especially Avon, whose former lover Anna Grant is eventually revealed to be a Federation agent.The theme of loyalty and trust reaches its maximum during Blake and Avon's final encounter in the last episode ("Blake"); Blake, by now very paranoid, has been masquerading as a bounty hunter collaborating with the Federation as a front for his activities in recruiting and testing potential allies in the struggle, and this causes Avon and the others to mistrust him when Tarrant accuses Blake of betraying them; an ironic miscommunication between Avon and Blake precipitates the disastrous events that conclude the episode.