In Earth year 3381 the first radio signals sent by our species reached the star system Tabby. After suspecting the Tabbisians that intelligent slaves might exist in the Solar System, they have decided to send an inspection fleet to Earth.

With their advanced engineering they have created a wormhole in the space-time fabric between their system and ours, which has been opened in the outer Solar System, in the Oort Cloud.

After their visit to Earth they have decided to return to Tabbi to report that their suspicions were true. Luckily their ships do not have hyperpropulsors equipped and can only move at sub-light speed, so the Earth ship “Alx” has been sent, the only one with a prototype hyperpropulsor, to wait for its arrival on the portal.

If he fails to destroy all Tabbisian ships ...
Humanity will be sentenced!