With Earth's impending destruction coming at any moment, Class 1-C boards the Paniponi X and prepares to intercept the comet (see episode #23 for details). Upon arriving in space they are shocked to find out that the comet is actually an Ichijo Festival that has become sentient and a large scale battle for the fate of the Earth erupts.
The Paniponi X begins as a Voltron-like robot tiger, transforms into a full on mech and later into a humanoid mech with a design similar to Eva Unit-01.
The aliens transform into Star Trek characters at random.
When absorbed by the Ichijo Festival, Class 1-C is confronted with a series of alternate possible realities, similar to what happens the End of Evangelion movie.
Continuing the Eva parodies, Class 1-C eventually does battle against a creature resembling Leliel from episode #16 of Neon Genesis Evangelion.