Question: List the show related to the which was followed by Doctor Who Extra?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/subsequentWork> <http://dbpedia.org/resource/Doctor_Who_Extra> . ?uri <http://dbpedia.org/ontology/related> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/TelevisionShow>}