Special effects art for the episode The Testament of Arkadia.
The Eagle returns from Arkadia. The landing is stock footage. In the event, the "cold and cheerless" Moonbase Alpha shot is also stock, but not marked here. Brian splits scene 58 into two shots, leaving the planet, and (58A) heading to the Moon. 58A wasn't used in the final episode, but we do see scene 69, which is "58A bigger moon".