These photos are largely from Breakaway
These Alphans are seen in the corridor behind Gorski when Koenig arrives on Moonbase Alpha; later they are thrown across the corridor during the Breakaway, and later they watch Koenig's announcement on the communications post. All these scenes were shot on Thursday 3rd January 1974, which is when these photos were made.
This technician is in the foreground when they all fall over. She is in numerous other episodes. The nurse with long blonde hair may be Maggie Henderson,
This is Janice Hills, as a security guard in the corridor scenes, and also as Main Mission operative.
Three more security guards (and Tony Allyn is also present). Female security guards don't seem to have stun guns. The last guard may be an actor called Murray Hayne (imdb).
Roy Everson, who also plays a guard in several other episodes.
Stuart Myers, a pilot here, who will reappear in several Year 2 episodes.
Pam Rose, who would regularly appear in Command Center in year 2.
Mike Stevens has an orange sleeve. He is seen (always from behind) with his clipboard walking up to communications posts while Koenig talks to Gorski.
This woman, with an orange sleeve, is talking to Alan Harris immediately behind Gorski when Koenig arrives; she and Harris are later among the Alphans thrown across the corridor during the breakaway.
These appeared in the flight control room, which was filmed on Tuesday 8th January 1974
This technician would appear in numerous episodes.
Jack McKenzie appeared in several episodes, and also appears in later corridor scenes (he was cut)
Melita Clarke appeared in the first three episodes.
This nurse has been identified as Fran Miller, who was a stand-in
These appeared on communications posts and on the small Main Mission screens, making announcements.
Loftus Burton as Main Mission operative Lee Oswald.
Lesley Stamps, who would appear throughout Year 1.
From Black Sun, we haven't seen this nurse in Main Mission, but she's watching the card game (standing, right), and later in the crowd scene at the end, on the right. Marc Zuber stands behind the Main Mission desk.