This pertians to The Roku Channel:
Earth Final Conflict S1E20 is mistakenly listed as "Destruction" which is actually episode 21. The real episode 20 is "Infection"; which, itself, is erroneously listed as Episode 22. That episode should be "The Joining."
These errors add a lot of confusion when watching since in the episode "Destruction" several reference are made to "Infection", which is supposed to have been seen beforehand.