In 1990, he was [[consecration of a bishop|consecrated]] [[bishop]] with the title of the formerly distinguished [[Diocese]] of Kyrēnē with the added appointment as representative of Patr. Parthenios in Athens. In this position he always accompanied Patr. Parthenios on his travels throughout Africa and to many international, interfaith, and Theological conferences.
In 1997, he was appointed Patriarchal [[Vicar]] by Patriarch Petros VII, to assist the new patriarch at the outset of his patriarchate. Ten months later Bp. Theodoros was elected [[Metropolitan]] of Cameroon. As the leader of this [[missionary]] diocese, Metr. Theodoros greatly expanded the missionary activity in the diocese. He encouraged the building of [[church]]es, schools, and hospitals, as well as helping many Africans and Hellenes.
In 2002, Metr. Theodoros was transferred to the holy Metropolis of Zimbabwe, where he established four missionary centers in Harare, a Hellenic Cultural Center that could hold 400 delegates, two large missionary centers in Malawi, with a hospital, technical schools, and nursery schools. Aided by the Greek Parliament he renovated the Hellenic Square (School-Church-Vicarage) in Beira, Mozambique. He founded churches and contributed to the establishment of the Hellenic Communities of Botswana and Angola.