Episode 48

Sonic vs. The Underground Monsters (ソニック対地底怪獣, Sonikku tai Chiteikaijū) is the 48th episode of Sonic X.

It is available in Japanese, French, Korean, Mandarin, Cantonese and Thai.

Its conventional length is 24:35. It uses opening 2 and ending 3.

The eyecatch cards are […] and […].

It ends with a preview of episode 49.