The Twin Dilemma happened on 1984-03-30.
Darwin's Dilemma happened in 1990.
The 1st serial was called "The Twin Dilemma"
Doctor Who - 1963 The Twin Dilemma Part Two 21-22 is rated/received certificates of: Australia:G UK:U UK:PG (DVD rating)
Doctor Who - 1963 The Twin Dilemma Part One 21-21 is rated/received certificates of: Australia:G UK:U UK:PG (DVD rating)
Doctor Who - 1963 The Twin Dilemma Part Three 21-23 is rated/received certificates of: Australia:G UK:U UK:PG (DVD rating)
Doctor Who - 1963 The Twin Dilemma Part Four 21-24 is rated/received certificates of: Australia:G UK:U UK:PG (DVD rating)
Twin Eagle happened in 1989.
Twin Hawk happened in 1989.
Darius Twin happened in 1991.
Twin Cobra happened in 1987.
Twin Kingdom Valley happened in 1983.
Twin Cobra II happened in 1997.