Is the LEGO Ultimate Battle Set (6637-1) still collectible?

Yes, as a 2005 Bionicle set, it is a collectible piece from that era of LEGO.

What is the original theme of this set?

The theme of set 6637-1 is Bionicle.

This set was released in the year 2005.

Name: LEGO Ultimate Battle Set (6637-1)
Brand: LEGO

Bionicle

Bionicle · 2005

Theme · BioniclePieces · 0Set Number · 6637-1Year · 2005

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Is the LEGO Ultimate Battle Set (6637-1) still collectible?: Yes, as a 2005 Bionicle set, it is a collectible piece from that era of LEGO.
What is the original theme of this set?: The theme of set 6637-1 is Bionicle.
When was the LEGO Ultimate Battle Set released?: This set was released in the year 2005.