# Stel Felso Theu — Invaders from the Infinite character guide

> Stel Felso Theu in Invaders from the Infinite by John W. Campbell.

**Role:** minor

**Also known as:** Stel Felso

**First appearance:** 0002-iii-a-quarter-of-a-million-light-years

## Who they are

A Thessian scientist and colleague of Zezdon Afthen.

## Relationships

### [Arcot](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/characters/arcot)

_professional_

Arcot works with Stel Felso Theu as a fellow scientist and ally in understanding advanced alien technology.

### [Arcot](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/characters/arcot)

_professional_

Arcot works with Stel Felso Theu as a fellow scientist and ally in understanding advanced alien technology.

## In the story

### [VIII: Undefeatable or Uncontrollable?](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/viii-undefeatable-or-uncontrollable)

Talsonian scientist who invented the weapon; explains its limitations and the power transmission problem.

### [IX: The Irresistible and the Immovable](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/ix-the-irresistible-and-the-immovable)

Demonstrates the original Talsonian weapon and is astonished by the terrestrians' quick mastery and improvement of the technology.

### [X: Improvements and Calculations](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/x-improvements-and-calculations)

Introduced as an ally from Talso, provides directions to a besieged city and accompanies Arcot in the Ancient Mariner.

### [XII: Sirius](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/xii-sirius)

Accompanies the group to Sirius, representing Talso in the alliance.

### [Intergalactic Space](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/xiv-intergalactic-space)

Advises caution about exploring; warns about primitive weapons and joins the landing party.

### [All-Powerful Gods](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/xv-all-powerful-gods)

Accompanies Arcot and Zezdon Afthen during the Egyptian landing.

### [Earth's Defenses](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/xviii-earth-s-defenses)

Warns Arcot that Earth is lost without aid, and accompanies the team to Eros.

### [XXV: With Galaxies in the Balance](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/xxv-with-galaxies-in-the-balance)

Asks Morey about the wall of blackness and learns its nature.

### [XXVI: Man, Creator and Destroyer](https://www.betterreads.dev/discover/invaders_from_the_infinite_se/chapters/xxvi-man-creator-and-destroyer)

Expresses awe and concern about the power of the proposed weapon; later returned home.

## Links

- HTML: https://www.betterreads.dev/discover/invaders_from_the_infinite_se/characters/stel_felso_theu
- Book: https://www.betterreads.dev/discover/invaders_from_the_infinite_se
- All characters: https://www.betterreads.dev/discover/invaders_from_the_infinite_se/characters