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John Koenig	Helena Russell	Victor B.	Paul M.	Alan Carter	Sandra Benes	D. Kano	Tanya A.	Bob Mathias	Kate Bullen	B. Ouma	Simmonds
		Maya	Tony V.			Bill F.	Yasko			Ben V.	Ed S.

Cast and Characters (Regular and Semi-Regular)

A Table of the regular and semi-regular cast of Space: 1999.

Regulars are those who appeared in more than one half of at least one season's episodes in a reasonably prominent role. The first four listed were credited directly in the opening theme sequence of one or both seasons.
Semi-regulars are those who appeared in at least a few episodes of at least one season, in at least a mildly-prominent role.
Other characters appeared in many episodes but in background or extremely brief roles (e.g. guards) are not listed in this entry.
The boundary points are admittedly somewhat arbitrary.
The 'Episodes' column of the Table (and *Notes as well) does not count "flashback footage" (from prior episodes) as an actual appearance, Blank cell in 'Episodes' column means verifiably no appearance in that Year; just a question '?' mark means the Editor is not sure whether there were any appearances.

Actor / Actress		Character			Y1	Y2
ML	Martin Landau	Cmdr. John Koenig	J	JK	all?	23?	*
BB	Barbara Bain	Dr. Helena Russell	H	HR	all?	all?
BM	Barry Morse	Prof. Victor Bergman	V	VB	all?
CS	Catherine Schell	Maya	M	M		23	*
NT	Nick Tate	Capt. Alan Carter	A	AC	all?	most?	*
TA	Tony Anholt	Tony Verdeschi	T	TV		21?	*
PH	Prentis Hancock	Paul Morrow	P	PM	most?
CJ	Clifton Jones	David Kano	K	DK	most?
ZM	Zienia Merton	Sandra Benes	S	SB	most?	11	*
AP	Anton Philips	Dr. Bob Mathias	B	BM	many?	2

	Suzanne Roquette	Tanya Aleksandr		TA	16?
	John Hug	Bill Fraser		BF		9
	Jeffrey Kissoon	Ben Vincent		BV		7
	Yasuko Nagazumi	Yasko	Y	Y		8
	Peter Porteous	Petrov		P		3
	Sam Dastor	Dr. Ed Spencer		ES		3
	Alibe Parsons	Alibe		A		3
	Sarah Bullen	Kate		K	16?	7
	Barbara Kelly	voice: Main Computer			a few?	?
	Albin Pahernik	some Maya creatures				some

Alan did not appear in the following (at least): "Brian the Brain", "Devil's Planet" (except by flashback?)
John did not appear in the following (at least): "Dorzak".
Tony did not appear in the following (at least): "The AB Chrysalis" (reverify?), "Devil's Planet" (reverify).
Maya did not appear in the following: "Devil's Planet" (except by flashback).
Sandra also appeared in the following: "Message from Moonbase Alpha"

Catherine Schell did appear as a guest character in a single Y1 episode, but as a different character than Maya, namely the Servant of the Guardian of Piri. This appearance does not count in this entry.