Kook

Kook was one of the crewmembers on the seamancer who was trapped on rigel four

he didnt take a shine to The Doctor and Martha as he blamed The Doctor for the whole event

when he was sentenced to death he made a deal with King alalal which resulted in the battle against Kalis and the surobans

Lord alalal turned on kook but the Doctor managed to rescue him in time

Kook then returned to earth leaving Captin ketly and his crew mates