Answer:

REX

AnswerCrossword Clue
REX"Oedipus .."
REXMardi Gras king
REXSergeant Preston's horse
REXActor ... Harrison
REXMardi Gras VIP
REXReviewer Reed
REXLetters after T
REXMardi Gras Monarch
REXMardi Gras royal
REXTelevangelist Humbard
REXCornish ... (short-haired cat)
REXKing of the Romans
REX"Fer-de-Lance" author Stout
REXMystery novelist Stout
REX"Wonder Horse" of 1920s-30s cinema
REXName that means "king" in Latin
REXTarquinius's title
REXWord in a Sophocles title
REXKingly title
REX"Toy Story" dinosaur
REXFriend for Rover and Fido
REXReason of "Salome"
REXT. ...
REXNero Wolfe creator Stout
REXOscar winner Harrison
REXLatin king
REXSilents director Ingram
REXFilm critic Reed
REXStout who created Nero Wolfe
REXT. ..
REXCritic Reed
REXDr. Morgan of comics
REXKing of ancient Rome?
REX"Wonder Dog" of comics
REXSheepdog in "Babe"
REXTyrannosaurus ..
REXJets coach Ryan
REXSpot playmate
REXName fit for a king?
REXStout of whodunits