Space 1999 S2 Ep 2 - F2F Transformations

Season 2 Episode 2 The Exiles
During her off time Helena is sculpting a bust of herself for John. While she is showing it to Maya, John stops by for a visit, but not before Maya transforms into Helena's double. John asks which is the "real" Helena. After a kiss from both of them, he is asked if he can tell the difference. He says there is none, and Helena tells him he is no longer getting the bust she made for him!