Bibi and Tina are the main characters of the German children's radio drama series of the same name, produced by the network Kiddinx. The Bibi and Tina Riding Farm episodes are a spin-off to the Bibi Blocksberg radio series. Tina and the Martinshof first appear in episodes 43 and 44 of Bibi Blocksberg. In episode 47 they appear once more. The radio series Bibi and Tina began subsequently in 1991. The series consists of 103 episodes, including 2 specials.