Episode 83: The Exercise of Vital Powers (Season 4, Episode 16)
Synopsis: In which Garibaldi returns to Mars and we learn more about Edgars’ plans.
The true mastermind behind Garibaldi’s mind control:
The fifth roommate in The Young Ones: https://dangerousminds.net/comments/wait_what_there_was_a_secret_fifth_roommate_on_the_young_ones_the_whole_tim
Ephrem ZImbalist Jr: https://www.imdb.com/name/nm0956544/?ref_=tt_cl_t15
Come in with the milk, come in with the milk: https://www.youtube.com/watch?v=uus--6heuw8
Most commercial telepaths (P5 level) do need line of sight for telepathy to work, which explains why Edgars wanted to be in another room unseen during Garibaldi’s testing. https://babylon5.fandom.com/wiki/Telepath
Lise met and married William Edgars in 2260, so it’s not clear if that was before or after the secession (not that my grand complicated conspiracy theory panned out anyway).