During ancient times, Sutekh's brother Horus and the remaining seven hundred and forty Osirians tracked Sutekh down to Egypt and used their powers to imprison him in the Black Pyramid. The Eye of Horus on Mars beamed a signal to suppress Sutekh's powers and hold him prisoner. The tales of the Osirians were remembered in Egyptian mythology. Sutekh still retained a cult of followers, such as Ibrahim Namin. (DW: Pyramids of Mars) However, not all of Sutekh's worshippers followed a creed of evil. (NA: Set Piece)
In the year 1911, the archaeologist Professor Marcus Scarman discovered the inner chamber of the Pyramid of Horus, discovering Sutekh and thereby accidentally allowing him a chance of escape. Sutekh controlled Scarman's corpse, using it and Osirian service robots to construct a rocket aimed at the Eye of Horus on Mars. The Fourth Doctor and Sarah Jane Smith were able to destroy the rocket, but the Doctor fell under the psychic control of Sutekh's will as a result. He was made to take Scarman and the robots to Mars in the TARDIS. Despite the Doctor's attempt to stop them, Scarman destroyed the Eye and freed Sutekh. Hurrying back to Earth, the Doctor defeated Sutekh by trapping him in a time tunnel for thousands of years — longer than the lifespan of an Osirian. (DW: Pyramids of Mars)
Habits and Quirks
Sutekh possessed immense power: he could change the course of history and destroy entire stellar systems. He was even able to contain the explosive force of gelignite, although this was difficult and could be easily disrupted by a simple distraction.
When yhe Fourth Doctor took Sarah Jane Smith to an alternate 1980, a ruined and abandoned wasteland due to Sutekh's destruction, he claimed not even the Time Lords could stop Sutekh if he were released from his prison.
Sutekh was incredibly powerful and easily able to defeat a Time Lord. His powers became apparent when his eyes glowed green, allowing him to leave a person in agonising pain for centuries. Furthermore, his mental abilities allowed him to easily dominate others, making them puppets to his will.
He also appeared to be able to telepathically read other beings like the Doctor and monitor progress several thousand miles away with the aid of Osiran computer techology. This included reanimating corpses for servants, as he did with Marcus Scarman. (DW: Pyramids of Mars)