Kill Your Television is the twenty-second level in Marathon 2: Durandal and the last level in the chapter Blake. The level can be divided into three large rectangular courtyards, connected by water-filled tunnels. The objective is two activate the last two Thoth personality cells.
There are many Cyborgs and F'lickta in this level, as well as some neutral Ticks.
There is a pattern buffer at the top of the central terminal in the first arena, along with an oxygen replenisher. A 2x shield recharger can be found in the north alcove in the southeast arena; another oxygen replenisher is found in the south alcove there.
Walkthrough[]
At the start of the level, you'll fall into in a large courtyard with pools of water located in each corner. On one side of the central pillar, you'll see a wall panel that's slightly darker than the rest (location 'A' on the map); this panel opens up to reveal a switch you should hit.
Proceed to the southwest corner and jump in the pool of water. At the bottom is a door that will allow you to swim all the way to the top to gain access to the ledge that surrounds the courtyard.
From the middle south pillar, you can jump to a pattern buffer and oxygen replenisher up in the middle pillar. The hidden switch you hit earlier activates these panels. There is also a Fusion Pistol here, some ammo, and a few 2x shield canisters.
Now head to the northeast corner of the upper ledge. Jump in the pool and dive all the way down, then follow the underwater tunnel east, then north. Take the first eastbound corridor you see, and swim to the surface. You'll end up on a ledge that overlooks a large pit (marked 'C1' on the map above). North of the large pit is smaller water-filled pit (marked 'C2' on the map above) with a half-submerged switch. Hitting that switch causes the water to drain from the small pit into the large one.
With the water in the large pit raised completely, you can now jump in and swim to a 2x shield recharger in an alcove on the north side of the basin. The south alcove contains an oxygen replenisher. On the western side of the pit you'll find a corridor to one of the personality cells that need to be activated. Just like on This Side Toward Enemy, the switch near the stairs controls the water level, and the switch across from you activates the AI machinery.
Make your way out of the large water-filled basin and go through the underwater tunnels to the northern area of the level. The water canals here form a rectangle with a cross in the middle. Swim northwest, into the "cross", and get to the surface to find a courtyard divided into four quadrants. Go to the south quadrant; you'll find another dark wall panel that's actually a hidden door (point 'D' on the map). Behind the door there's an elevator that takes you up to the upper ledge running around the inner area.
On the west ledge, you'll find a passage leading to the outer ledge. Follow it around the north side of the area to the east, where you will find a TOZT-7 Backpack Napalm Unit at the end of the ledge. You'll also find the last personality cell to activate.
After the both personality cells have been activated, go to the underwater terminal at the southeast corner of the northern section of the map. This terminal will teleport you to Where the Twist Flops.
Terminals 
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This terminal initially contains a final, prerecorded message from Robert Blake. He says that the Pfhor have sent their Cyborgs to assault the human/S'pht base. These cyborgs are immune to the ancient virus the S'pht originally used in their war against the Pfhor. Blake goes on to say they're being forced to retreat deeper underground. To save them, you need to activate Thoth's final two AI personality cells. No one knows for sure what happens when he is activated, but you will be defeated for sure if he doesn't help you.
If you have completed the objectives on this map and return to this terminal, you'll find a mysterious, unformatted message. It's about an age-old hero, who faces an ancient adversary; he loves her, even though she apparently has terrible, violent powers and cares for nothing but his ruin.
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When you haven't yet activated both personality cells, this terminal contains a scrambled, almost illegible message from Thoth, mentioning something about waiting a thousand years and not yet being ready.
Once all of Thoth's sites have been activated, you'll find a far more lucid Thoth message. He says your human companions are near death, and he'll teleport you to them to save them.
Sources[]
Marathon 2: Durandal - Level 22: Kill Your Television