@StarTrek
Each show requires licensing to be carried. Often times, a channel/app is unable to carry certain seasons or episodes because currently being carried by another with the license or may just be unavailable for licensing. At other times, additional seasons and episodes may just be added at a later time.
The Filmzie Channel is streaming Seasons 1-5 so at least you get an additional season there currently.
(https://channelstore.roku.com/details/3e0f0abc7c114ca18e54413752954873/filmzie)
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102