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Planet

A List of planets encountered by the Alphans or otherwise mentioned in the series.

Mars? (a "Mars Satellite" mentioned in Breakaway)
Terra Nova (MOLAD)
Jupiter (mentioned in MOLAD)
Triton, destroyed world (mentioned in RATM)
Kaldor, a dying world (mentioned in "Earthbound")
Zenno ("Missing Link")
Piri (GOP): a dead world, reborn after the Alphans cause the destruction of the Guardian.
Ariel ("The Last Sunset")
Atheria ("Collision Course")
Ultima Thule (in DOD)
Uranus (mentioned in DOD)
Retha ("The Full Circle")
unnamed planet (with two suns) in "War Games"
Betha (in "Last Enemy")
Delta (ditto)
Arkadia (TOA)

Crom II: mentioned in Mark of Archanon (640 DAB), a Y2 episode; but the encounter itself could have been either beforehand in Y2, or in Y1.

Psychon
Golos ("The Exiles")
Vega (OMOH)
unnamed planet in "All that Glisters"
Pinvith the Lesser (?): listed by Taybor as his "natal soil" (presumably a planet).
Azoth: listed by Taybor as a place he just visited, on which there was just a "Three Worlds Fair" (Azoth presumably being a planet).
Luton ("The Rules of Luton")
Planet D ("Brian the Brain")
New Earth
unnamed chlorine planet (and its six moons) in "The AB Chrysalis"
Sunim ("Matter of Balance")
Venus (mentioned in "The Lambda Factor")
Tora proto-planet (in "The Seance Spectre")
unnamed planet in "The Immunity Syndrome"