 During his first spell, Mejías constantly alternated between the top level and Segunda División, promoting three times to the former and being relegated to the latter in 1982 and 1984.In the 1982–83 campaign he scored a career-best 15 goals, helping the "Gaditanos" return to the top tier.Mejías left Cádiz in the summer of 1986, joining fellow league side Real Zaragoza.