The Lost Echoes (Television Story)

The Lost Echoes is the fourth story of Season 2 and is one of the few stories written by Rod Serling
Synopsis
A astronaut with no memories aboard a ship  with no memory why he's there as the TARDIS crew investigates The Doctor discovers an artifact on board that is able to absorb and manipulate the person's memories it's called Mnemonic Manipulator, it was left behind by a long-extinct alien race named The Chroton and discover that this surviving race not only wants his memories...but he also wants The Doctor's memories too
Plot
The Doctor, Susan, Joanne, and Carlos arrive on a desolate spaceship drifting in deep space. They discover a lone astronaut named John Blake floating outside the ship with complete memory loss. John has no idea who he is, where he's from, or how he ended up in space.
As the TARDIS crew investigates, they encounter strange echoes throughout the ship. These echoes seem to possess Max's lost memories, echoing in haunting whispers. The Doctor realizes that Blake's mind is connected to an alien artifact onboard the ship, which has the ability to absorb and manipulate memories.
The Doctor and the TARDIS team must navigate the treacherous corridors of the ship, confronting the echoes while trying to disable the artifact. Along the way, they encounter an enigmatic villain, the Chroton, who manipulates the echoes to use Max's lost memories against them but when confronted with The Doctor The Chroton bargains a deal to the Doctor, he said he will slowly let Blake's memories go in exchange for The Doctor's, The Doctor is puzzled to why The Chroton would want his memories more than Max's. The Chroton explains that with the knowledge The Doctor has knows more to him then he thinks The Chroton knows The Doctor is a time lord and knows how special the time lords are. As if he were to have The Doctor's memories he'd soon find a way to not only find the weaknesses of The Time Lords but to become one with The Chrotons uniting the two together in peace. but The Doctor declines saying that the time lords will never accept The Chroton's to unite with The Time Lords as it's revealed that The Time Lords had named Chrotons to be obsolete to the time lords and were exiled centuries ago after wanting to know the knowledge of the future to help at their time of need. as the time lords believed that no superior race of the time lords should know one's future and thus were completely banished.
As John Blake slowly regains fragments of his identity, the TARDIS crew races against time to rescue him from the clutches of the Chroton and reverse the artifact's effects. They discover the key to freeing Max's lies in a forgotten personal item onboard the ship, which holds a significant emotional connection to him.
In a climactic confrontation, the Doctor outwits the Chroton, disarms the Mnemonic Manipulator, and restores Blake's memories. With his identity regained, John Blake is reunited with his lost past and grateful for the Doctor and their companions' assistance.
However, the Doctor realizes that the Chroton may have harvested valuable information from the Mnemonic Manipulator before their defeat. The episode ends with a cliffhanger, hinting at a new threat looming in the Doctor's future adventures.
Production
Home Media Release