Script iTunes to prepend Season and Episode number (padded) to episode title
I think this will do it for you:

use AppleScript version "2.4" -- Yosemite (10.10) or later
use scripting additions
--
-- Start by selecting the shows in a playlist. 
-- Don't select the playlist. Select the Shows.

tell application "iTunes"
    set theShowList to the selection
    repeat with aShow in theShowList
        -- get the information we need
        set theSeasonNumber to season number of aShow
        set theEpisodeNumber to episode number of aShow
        set theName to name of aShow
        --
        -- pad the episode number to two digits
        set thePaddedEpisodeNumber to "0" &amp; theEpisodeNumber as string
        set theTwoDigitEpisodeNumber to characters -2 thru -1 of thePaddedEpisodeNumber as string
        --
        -- assemble the new name
        set theNewName to theSeasonNumber &amp; theTwoDigitEpisodeNumber &amp; " " &amp; theName as string
        --
        -- set the new name
        set the name of aShow to theNewName
    end repeat
end tell


The script could be cleaned up and made more efficient but I wrote it this way so it was easier to follow. 

Be sure to select the shows, not the playlist. It doesn't work otherwise.

While experimenting with this I noticed that some TV shows have episode numbers that are three digits already. That would be a problem for this script. FYI.

This was done with iTunes 12.9.5.5, macOS Mojave 10.14.6.

Here are before and after pictures. You're going to have to zoom in.